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Question: 14 runners participate in the marathon event. It is said that each player needs 5 bottles of water. If you currently have 68 bottles of water, how many more bottles do you need to avoid running out? Answer: If each runner needs 5 bottles of water and there are 14 runners, then the total number of bottles need...
Question: You have 45 (A) animals and 32 (B) animals. (B) animals and (C) animals are 8 fewer than (A) animals. How many (C) animals are there? Answer: Let's denote the number of (C) animals as C. According to the problem, the total number of (B) animals and (C) animals together is 8 fewer than the number of (A) anima...
Question: If 1256 students are enrolled in a school, the first graders are 408 fewer than the total of students excluding first year. How many students are in first grade? Answer: Let's denote the number of first graders as F. According to the problem, the total number of students excluding first graders is 1256 - F. ...
Question: Item (A)s are divided into 4 boxes with 6 in each box. How many boxes are needed to pack 3 items in a box? Answer: If there are 4 boxes with 6 items (A) in each box, that means there are a total of 4 boxes * 6 items/box = 24 items. If you want to pack these items into boxes with 3 items in each box, you woul...
Question: How many numbers are less than or equal to 1.1 out of five numbers: 1.4, 9/10, 1.2, 0.5, and 13/10? Answer: To determine how many numbers are less than or equal to 1.1, we need to compare each of the given numbers to 1.1. The given numbers are: 1.4 9/10 1.2 0.5 13/10 Let's compare each number to 1.1: 1.4 i...
Question: There are 3 red clothes and 7 yellow clothes in the closet. How many clothes can you wear? Answer: Assuming all the clothes in the closet are wearable and fit you, you can wear a total of 10 clothes (3 red + 7 yellow).
Question: The average of the five numbers is 8. If you take one of these numbers and change it to 8, the average is 9. What is the original number before the change? Answer: Let's call the original five numbers A, B, C, D, and E. The average of these five numbers is 8, so the sum of these numbers is 5 times 8, which is...
Question: The six-digit number 12ABC8 is a multiple of 137. In this case, how many numbers fit the 3-digit number ABC? Answer: To find the possible values for ABC, we need to find the multiples of 137 that fit into the pattern of 12ABC8. First, let's find the range of multiples of 137 that could fit into the six-digi...
Question: Find the sum of each digit of the quotient of 111111 divided by 3. Answer: First, let's find the quotient of 111111 divided by 3. 111111 ÷ 3 = 37037 Now, let's find the sum of each digit of the quotient 37037. 3 + 7 + 0 + 3 + 7 = 20 The sum of each digit of the quotient is 20.
Question: When a teacher gave an equal amount of 8204 candies, with 28 candies per student, to the 2nd graders, and there were no candies left. How many 2nd graders are there? Answer: To find out how many 2nd graders there are, you need to divide the total number of candies by the number of candies each student receive...
Question: How many faces are there in a regular tetrahedron? Answer: A regular tetrahedron has 4 faces. Each face is an equilateral triangle.
Question: A is the same as 1 group of 100 and 23 groups of 10. If B is the number that is increased 4 times by 105 from 172, what is the sum of A and B? Answer: First, let's find out what A is. A is 1 group of 100 and 23 groups of 10. So: A = 1 * 100 + 23 * 10 A = 100 + 230 A = 330 Now let's find out what B is. B is ...
Question: On a ranch there are more pigs than cows and fewer pigs than chickens. What are the most common animals on a ranch? Answer: Based on the information provided, the most common animals on the ranch would be chickens, since there are fewer pigs than chickens and more pigs than cows.
Question: When I mistakenly multiplied a decimal that should be divided by 12, I got 84.6. Find the original decimal. Answer: If you mistakenly multiplied a decimal by 12 and got 84.6, we can find the original decimal by dividing 84.6 by 12. So, the calculation would be: 84.6 ÷ 12 = 7.05 Therefore, the original deci...
Question: In a two-digit number subtraction, the unit digit of the minuend was originally 3, but it was mistaken for 5. Also, by changing the tens digit and the unit digit of the subtrahend, mistakenly thought that it was 25 and calculated it as 60. Find the result of the correct calculation. Answer: Let's denote the o...
Question: There are 168 pieces of red confetti and 173 pieces of yellow confetti. Which color of confetti do you have more? Answer: You have more yellow confetti, with 173 pieces compared to 168 pieces of red confetti.
Question: A trapezoid was created by cutting a parallelogram. The upper side of this trapezoid is 15 centimeters (cm) and the lower side is 9 centimeters (cm). If the height of the trapezoid is 12 centimeters (cm), how many centimeters (cm) is the side of a square with the same area as the trapezoid? Answer: To find t...
Question: Jimin moved at 60 kilometers (km) per hour for two hours. If the destination is 300 kilometers (km) away, how far does Jimin have to go? Answer: If Jimin moved at 60 kilometers per hour for two hours, he would have covered a distance of: 60 km/hour * 2 hours = 120 kilometers If the destination is 300 kilome...
Question: The sum of 5 consecutive even numbers is 240. Write the smallest of these 5 numbers. Answer: Let's denote the smallest of the five consecutive even numbers as \( n \). Since they are consecutive even numbers, the next four numbers would be \( n+2 \), \( n+4 \), \( n+6 \), and \( n+8 \). The sum of these five...
Question: There is a cuboid-shaped brick that is 20 centimeters (cm) long, 12 meters (m) wide, and 10 centimeters (cm) high. What is the volume of the largest cube-shaped brick that can be made by cutting this brick? Answer: To determine the volume of the largest cube-shaped brick that can be made by cutting the given ...
Question: There is a figure with 9 sides with each side length of 2 centimeters (cm). What is the perimeter of this shape in centimeters (cm)? Answer: The perimeter of a polygon is the sum of the lengths of all its sides. Since the figure has 9 sides and each side is 2 centimeters long, the perimeter P can be calculate...
Question: I used several wires to make a cube with a volume of 3375 cubic centimeters (cm3). Find the length of wires used to make it. Answer: To find the length of the wires used to make the cube, we first need to determine the length of one edge of the cube. Since the volume of a cube is given by the formula V = s^3,...
Question: You have a rectangle with a length of 15 centimeters (cm) and a width of 0.9 of its length. Find the area of this rectangle in square centimeters (cm2). Answer: To find the area of a rectangle, you multiply the length by the width. Given that the width is 0.9 times the length, we can calculate the width as f...
Question: How many centimeters (cm) will be the length of a 49 centimeters (cm) wire if it is divided into 7 equal parts? Answer: If a 49 cm wire is divided into 7 equal parts, each part will be: 49 cm / 7 = 7 cm So, the length of each part will be 7 cm.
Question: There are five numbers 10, 11, 12, 13, and 14. What is the sum of the smallest number and the next smallest number? Answer: The smallest number is 10 and the next smallest number is 11. The sum of these two numbers is: 10 + 11 = 21.
Question: I am trying to hang pictures with a width of 30 centimeters (cm) in a row on a bulletin board that is 3 meters (m) and 20 centimeters (cm) wide. How many centimeters (cm) should the distance between the board and the picture and the distance between the pictures be, if all six pictures are hung at the same di...
Question: Find the minimum number of bricks required to make a cube by stacking bricks with a width of 18 centimeters (cm), a depth of 12 centimeters (cm), and a height of 9 cm (cm). Answer: To make a cube by stacking bricks, the dimensions of the cube must be a multiple of the dimensions of the bricks. Since the brick...
Question: 7/12 of a certain number is 42. What is a value of 4 less than 11/18 of this number? Answer: Let's call the certain number "N". According to the given information, 7/12 of N is 42. We can write this as an equation: (7/12) * N = 42 To find the value of N, we can solve for N by multiplying both sides of the ...
Question: If you draw a line bisector of the vertex angle of an isosceles triangle, the length of the each divided base is 4 meters (m). How many meters (m) is the total length of the base? Answer: If the line bisector of the vertex angle of an isosceles triangle divides the base into two equal parts, and each part is ...
Question: A triangle has a total of 3 vertices. If two of these vertices are selected and the segment connected is a triangle with a length of 8 centimeters (cm) and an area of 24 square centimeters (cm2), how many centimeters is the distance between the unselected vertex and the segment formed by the selected vertex. ...
Question: To make one ribbon, you need 4 meters (m) of string. If Jimin bought 105.8 meters (m) of string, make as many ribbons as possible and find the length of the remaining string. Answer: To find out how many ribbons Jimin can make with 105.8 meters of string, we need to divide the total length of string he has by...
Question: You have a stick that is 28 meters (m) long. How many slices can you get if you cut this stick by 1.12 meters (m) each? Answer: To find out how many slices of 1.12 meters you can get from a 28-meter stick, you divide the total length of the stick by the length of each slice: Number of slices = Total length o...
Question: There are aliens with cube-shaped heads. The surface area of this alien's head is 150 square centimeters (cm2). Find the volume of the head. Answer: To find the volume of the alien's cube-shaped head, we first need to determine the length of one side of the cube. Since the surface area of a cube is given by t...
Question: The sum of three consecutive even numbers is 18 greater than the smallest even number among those three. What is the largest one among the 3 even numbers? Answer: Let's denote the smallest even number as \( x \). Since we are dealing with consecutive even numbers, the next two even numbers would be \( x + 2 \...
Question: The rectangle is 11 centimeters (cm) wide and 8 centimeters (cm) long. The base and the height of a parallelogram are 12 centimeters (cm) and 7 centimeters (cm), respectively. Which shape has the largest area? Answer: To determine which shape has the largest area, we need to calculate the area of both the rec...
Question: Yoochan walks 0.75 meters (m) in one step. If Yoochan walks straight for 13 minutes at 70 steps per minute, find how many meters (m) the current location of Yoochan is from the first location. Answer: To find out how many meters Yoochan has walked, we first need to calculate the total number of steps he has t...
Question: A certain number multiplied by 7 minus 6 minus 12 equals the number multiplied by 4. Find the certain number. Answer: Let's denote the certain number as \( x \). According to the problem, we have the equation: \( 7x - 6 - 12 = 4x \) First, let's simplify the left side of the equation by combining like term...
Question: Yein wrapped three presents with ribbon. She used 1/2 of the total ribbon to wrap the first present, 1/3 of the remaining ribbon to wrap the second present, and 1/2 of the remaining ribbon to wrap the third present, leaving 250 centimeters (cm). How much ribbon did Yein have at first? Answer: Let's denote th...
Question: The weight of a full bottle of sesame oil is 3.4 kilograms (kg). If the weight of the bottle after using 1/5 of the sesame oil is 2.98 kilograms (kg), find the weight of the empty bottle in kilograms (kg). Answer: Let's denote the weight of the empty bottle as \( W_{empty} \) and the weight of the sesame oil ...
Question: If you add the allowance of Yul-gi and Ga-yeong have, you get 6,000 won. If you subtract the difference between their allowance from the sum of their allowance, you get 4,800 won. If Yul-gi's allowance is more than Ga-yeong's, find out how much Yul-gi's allowance is. Answer: Let's denote Yul-gi's allowance as...
Question: There are a total of 4 numbers: 0.8, 1/2, 0.5, 1/3. How many of these numbers are less than 3? Answer: All of these numbers are less than 3. 0.8 is less than 3. 1/2 (which is 0.5) is less than 3. 0.5 is less than 3. 1/3 (which is approximately 0.333) is less than 3. Therefore, all 4 numbers are less than 3.
Question: What is the sum of all natural numbers greater than 28 and less than or equal to 31? Answer: The natural numbers greater than 28 and less than or equal to 31 are 29, 30, and 31. To find the sum of these numbers, simply add them together: 29 + 30 + 31 = 90 So, the sum of all natural numbers greater than 28 ...
Question: Round down the largest four-digit number you can make using four cards 7, 9, 3, and 6 only once each to the nearest tenth. Answer: The largest four-digit number that can be made using the digits 7, 9, 3, and 6 is 9763. To round this number down to the nearest tenth, we need to look at the digit in the tenths...
Question: Minyoung has 9 dogs, 3 cats, and 5 rabbits, and Yoojeong has 2 more animals than Minyoung. If Yoojeong has 7 dogs and 2 fewer cats than rabbits, how many rabbits does Yoojeong have? Answer: First, let's find out how many animals Minyoung has in total. Minyoung has: 9 dogs 3 cats 5 rabbits Total animals Miny...
Question: What is the sum of the second largest and second smallest odd numbers from 1 to 15? Answer: The odd numbers from 1 to 15 are: 1, 3, 5, 7, 9, 11, 13, and 15. The second smallest odd number in this range is 3. The second largest odd number in this range is 13. The sum of the second smallest and second largest...
Question: The rectangular ranch fence has a perimeter of 30 meters (m), and the length of the fence is twice its width. What is the length of the fence in meters (m)? Answer: Let's denote the width of the fence as \( w \) meters and the length of the fence as \( l \) meters. According to the problem, the length is twic...
Question: There are five numbers 10, 11, 12, 13, and 14. What is the remainder of the largest number divided by the next largest number? Answer: The largest number among the given numbers is 14, and the next largest number is 13. To find the remainder when 14 is divided by 13, we perform the division: 14 ÷ 13 = 1 wit...
Question: Minji drank 0.26 liters (L) of water in the morning and 0.37 liters (L) in the afternoon. How many liters (L) of water did Minji drink today? Answer: To find out the total amount of water Minji drank today, we need to add the amount she drank in the morning to the amount she drank in the afternoon. Morning: ...
Question: Ji-woo and Seunghye saw the same number, but Jiwoo shifted the decimal point of the number one space to the right by mistake. If the difference of the number Seunghye saw and the number Jiwoo saw is 37.35, what is the number that Seunghye saw? Answer: Let's denote the number Seunghye saw as \( x \). Since Ji...
Question: A cuboid has a volume of 28 cubic centimeters (cm3) and a height of 4 centimeters (cm). What is the area of the base? Answer: To find the area of the base of the cuboid, we can use the formula for the volume of a cuboid, which is: Volume = Base Area × Height Given that the volume is 28 cm³ and the height is...
Question: The perimeter of the eastern lake has 96 trees at 10m (m) intervals, and the perimeter of the western lake has 82 trees at 20 m (m) intervals. What is the difference between the circumferences of the two lakes in meters (m)? Answer: To find the circumference of each lake, we can use the number of trees and th...
Question: After Jungkook walked 3 kilometers (km) and 7 meters (m), he walked a few more meters (m). After a break, he took a walk for 840 meters (m), and it turned out that he walked 6 kilometers (km) and 30 meters (m) in total. How many meters (m) did Jungkook walk before the break? Answer: First, let's convert the t...
Question: A number must be divided by 8, but when you accidentally divide it by 7, the quotient is 12 and the remainder is 5. Find what the quotient would be if calculated correctly. Answer: Let's denote the number as \( N \). When you divide \( N \) by 7, the quotient is 12 and the remainder is 5. This can be represe...
Question: Find the sum of the largest and smallest three-digit numbers whose hundreds digit is 4 and whose tens digit is 8. Answer: The largest three-digit number with a hundreds digit of 4 and a tens digit of 8 is 489. The smallest three-digit number with a hundreds digit of 4 and a tens digit of 8 is 480. Now, let'...
Question: A rectangular parallelepiped is 9 centimeters (cm) wide and 7 centimeters (cm) long. If the volume is 315 square centimeters (cm2), how many centimeters (cm) is the height of this cuboid? Answer: To find the height of the rectangular parallelepiped (also known as a cuboid), we can use the formula for the volu...
Question: In the line, Seokjin stands 8th from the front and 6th from the back. Find the total number of students standing in the line. Answer: To find the total number of students in the line, we need to consider Seokjin's position from both the front and the back. Seokjin is 8th from the front, which means there are...
Question: When 52.5 kg (kg) of sweet potato is divided by 5 kg (kg) per person, find how many grams (g) of sweet potato are left after sharing. Answer: First, we need to determine how many people can receive sweet potatoes based on the given amount and the amount per person. We have 52.5 kg of sweet potatoes and each...
Question: 8050 multiplied by a number gives 80.5. What number is it? Answer: To find the number that, when multiplied by 8050, gives 80.5, you can set up the equation: 8050 * x = 80.5 Now, solve for x by dividing both sides of the equation by 8050: x = 80.5 / 8050 x = 0.01 So the number is 0.01.
Question: I made a rectangle by arranging 4 Go stones horizontally on each row and 8 vertically on each column. How many Go stones are at the perimeter? Answer: To calculate the number of Go stones at the perimeter of the rectangle, we need to count the stones along the edges without double-counting the corners. Since...
Question: You are trying to find the case of choosing two different fruits. There are fruits including apples, peaches, pears, melons, and tangerines. How many cases are available? Answer: To find the number of cases available for choosing two different fruits from the given list, we can use the combination formula, wh...
Question: In a toy factory, machine A makes 288 toys in 12 days, and machine B makes 243 toys in 9 days. Find the difference between the number of toys made per day by the two machines. Answer: First, let's calculate the number of toys made per day by each machine. For machine A: It makes 288 toys in 12 days, so the n...
Question: What number divided by 10 gives 12? Answer: To find the number that, when divided by 10, gives 12, you can set up the equation: x / 10 = 12 To solve for x, multiply both sides of the equation by 10: x = 12 * 10 x = 120 So, the number that divided by 10 gives 12 is 120.
Question: I made a mistake and added 7/5 to this particular number, when I had to subtract 7/5 from this number and then multiply it by 5, and it became 81/20. Find the rightly calculated value. Answer: Let's call the particular number you're referring to as "x." According to your statement, you mistakenly added 7/5 t...
Question: There are single-digit numbers A and B. If A56B made using these two is divisible by 36, how many numbers are there for A? Answer: For a number to be divisible by 36, it must be divisible by both 4 and 9, since 36 is the product of these two numbers and they are co-prime. 1. Divisibility by 4: A number is di...
Question: There are three numbers 10, 11 and 12. What is the sum of the largest number and the next largest number? Answer: The largest number is 12 and the next largest number is 11. The sum of these two numbers is: 12 + 11 = 23.
Question: There are 240 kilograms (kg) of apples in the market, and there are three times as many pears as apples. How many kilograms (kg) are there in both apples and pears? Answer: If there are three times as many pears as apples, then the weight of the pears is: 3 times the weight of the apples = 3 * 240 kg = 720 k...
Question: When 10-A=6, find the number that must be in A. Answer: To find the number that must be in A, we can solve the equation 10 - A = 6 for A. 10 - A = 6 Subtract 10 from both sides of the equation to isolate the variable A on one side: - A = 6 - 10 - A = -4 Now, to solve for A, we need to multiply both sides...
Question: 2 rabbits eat 4 carrots a day. How many days will it take for 3 rabbits to eat 54 carrots? Answer: First, let's find out how many carrots one rabbit eats per day. If 2 rabbits eat 4 carrots a day, then one rabbit eats half of that amount, which is 2 carrots a day. Now, let's find out how many carrots 3 rabbi...
Question: There is a rectangular notebook with a width to height ratio of 7:5. If the perimeter of this notebook is 48 centimeters (cm), what is the area in square centimeters (cm2) of this notebook? Answer: Let's denote the width of the notebook as \(7x\) and the height as \(5x\), where \(x\) is a common factor. The p...
Question: There is a flower garden in the shape of a circle. Assume the pi as 3 and the radius of the flower garden is 0.6 meters (m), how many square meters (m2) is the area of the flower garden? Answer: To find the area of a circle, you use the formula: Area = π * r^2 Where π (pi) is approximately 3, and r is the r...
Question: A basket full of persimmons of the same size and weight weighed 62 kilograms (kg). After removing half of the persimmons, I weighed them together with the basket and found that they weighed 34 kilograms (kg). What is the weight of the basket without the persimmons? Answer: Let's denote the weight of the baske...
Question: Machine A alone takes 10 hours to complete the job, and machine B takes 15 hours to complete the job alone. How many hours would it take for A and B to do this at the same time? Answer: To solve this problem, we can use the concept of rates of work. Machine A completes the job in 10 hours, so its rate of wo...
Question: There are different numbers A, B, C and D. In the case of A+C=15, A-B=1, C+C=A and B-D=2, get D. Answer: Let's solve the equations step by step. 1. From A + C = 15, we have: A = 15 - C (Equation 1) 2. From A - B = 1, we have: B = A - 1 (Equation 2) 3. From C + C = A, we have: 2C = A (Equation 3) ...
Question: Dividing 3 times of a certain number by 5, and subtracting 220, and multiplying that by 4 resulted in 320. Find out that number in question. Answer: Let's denote the certain number as \( x \). According to the problem, we have the following equation: \[ \frac{3x}{5} - 220 \] This result is then multiplied ...
Question: During the origami class, Donggeon folded the paper in a triangular shape with a base of 3 centimeters (cm) and a height of 2 centimeters (cm), and Jihye folded the paper in a triangular shape with a base of 3 centimeters (cm) and a height of 6.02 centimeters (cm). How many times the area of the triangle fold...
Question: Yujeong had 4 erasers, and she got 3 more from her sister. Eunji gave 7 of the 13 erasers she had to her sister. Who has more erasers, Yujeong or Eunji? Answer: Yujeong started with 4 erasers and got 3 more from her sister, so she now has: 4 + 3 = 7 erasers. Eunji started with 13 erasers and gave 7 to her s...
Question: There are five number cards 1, 3, 5, 7, and 9. How many three-digit natural numbers that can be made using this card are greater than 500? (However, the card can be used repeatedly.) Answer: To form a three-digit number greater than 500 using the cards 1, 3, 5, 7, and 9, we need to consider the hundreds, tens...
Question: There are 18 boxes that can fit 15 masks. If there are 3 masks lacking in each box, what is the total number of masks? Answer: If each box can fit 15 masks but there are 3 masks lacking in each box, then each box actually contains 15 - 3 = 12 masks. Since there are 18 boxes, the total number of masks is 18 b...
Question: We want to draw a circle with a radius of 2 centimeters (cm) inside a square with a side length of 8 centimeters (cm) without overlapping. How many can you draw in all? Answer: To determine how many circles with a radius of 2 cm can fit inside a square with a side length of 8 cm without overlapping, we need t...
Question: Injun has a running race. If Injun runs for 20 seconds without stopping, he can run 150 meters (m). How many meters (m) can Injun run for 1 minute without rest? Answer: First, we need to determine how many 20-second intervals are in 1 minute. Since 1 minute is equal to 60 seconds, we divide 60 seconds by 20 s...
Question: How many vertices are there in a regular octahedron? Answer: A regular octahedron has 6 vertices. It is one of the five Platonic solids and has eight equilateral triangular faces, twelve edges, and six vertices where four edges meet at each vertex.
Question: There are four numbers 10, 11, 12, and 13. What is the remainder of the largest number divided by the next largest number? Answer: The largest number is 13 and the next largest number is 12. When you divide 13 by 12, you get 1 with a remainder of 1. So, the remainder of the largest number divided by the ne...
Question: You want to create an eight-digit number by using the four numbers 4, 0, 2, and 6 twice. Find the sum of the largest and smallest possible numbers. Answer: To create the largest possible eight-digit number using the digits 4, 0, 2, and 6 twice, we should place the largest digits in the highest place values. T...
Question: Among 1/4, 0.2, 1/3, 2/7, 0.25, and 1/6, how many are less than or equal to 0.3? Answer: To compare these numbers, it's easiest to convert them all to decimals or to fractions with a common denominator. Let's convert the fractions to decimals: 1/4 = 0.25 1/3 ≈ 0.333 (repeating) 2/7 ≈ 0.2857 (repeating) 1/6 ≈...
Question: When three different numbers are drawn from 4, 0, 9, and 8 to form a three-digit number, find the third smallest number among them. Answer: To find the third smallest number formed by three different digits from the set {4, 0, 9, 8}, we need to consider the place values of the digits in a three-digit number. ...
Question: When 4 students who are Hyunji, Eunjeong, Migeum, and Youngmi are lined up in a row, find the number of cases where Eunjeong stands at the front or at the back. Answer: To solve this, we can consider two separate cases: one where Eunjeong is at the front and one where Eunjeong is at the back. Case 1: Eunjeon...
Question: Subtracting some number from 913 gives 514. How much is 514 minus some number? Answer: To find the number that was subtracted from 913 to get 514, we can set up the equation: 913 - x = 514 To solve for x, we subtract 913 from both sides of the equation: x = 913 - 514 x = 399 So the number that was subtrac...
Question: I mistakenly added what should have subtracted 2.95 from a number, and I got 9.28. Find the correct calculated value. Answer: If you mistakenly added 2.95 to a number instead of subtracting it, and the result was 9.28, you can find the correct value by first undoing the incorrect addition and then performing ...
Question: You are going to put 235 bracelets in a bag of 10 each and sell them for 3,000 won. What is the maximum amount you can get for selling a bagged bracelet? Answer: To find the maximum amount you can get for selling a bagged bracelet, we need to determine how many full bags of 10 bracelets you can make with 235 ...
Question: In the calculation of adding two-digit numbers, the number 7 in the ones was mistaken for 1 and the number 4 in the tens was mistaken for 6, and the result was 146. Find out the result when correctly calculated. Answer: Let's denote the correct two-digit numbers as AB and CD, where A and C are the tens digits...
Question: When you add 30 to a number, you get 55. What is the result of subtracting the number by 23? Answer: Let's call the unknown number "x". According to the information given: x + 30 = 55 To find the value of x, we subtract 30 from both sides of the equation: x + 30 - 30 = 55 - 30 x = 25 Now, we want to subtr...
Question: A number is multiples of 5, and when divided by 5, the quotient is 25. Find the value of subtracting 17 from the number and then divided by 6. Answer: Let's denote the number as \( N \). Given that \( N \) is a multiple of 5 and when divided by 5, the quotient is 25, we can write this as: \[ N = 5 \times 25 ...
Question: A particular number multiplied by 4 results in 5/2. What number do you get when you divide that particular number by 5/24? Answer: Let's call the particular number we are looking for "x". According to the problem, when we multiply x by 4, we get 5/2. So we can write this as an equation: 4x = 5/2 To find x,...
Question: There are four types of milk sold at a store: chocolate milk, strawberry milk, banana milk, and coffee milk. When selecting milk from this store, find the number of ways to select 2 cartons of milk, allowing duplicatio. Answer: When selecting 2 cartons of milk with duplication allowed, we can use the formula ...
Question: Use the three number cards 3, 4, and 7 to create a three-digit number. In here, find the largest value among the numbers with 7 at the front. (However, you cannot use number cards repeatedly.) Answer: To create the largest three-digit number with 7 at the front, we need to place the next largest number in the...
Question: Taeyeon and Yura solved the problem book. Taeyeon solved 16 questions a day for 7 days and Yura solved 25 questions a day for 6 days. How many problems did Taeyeon and Yura solve? Answer: To find out how many problems Taeyeon and Yura solved, we need to calculate the total number of problems each of them solv...
Question: There is a two-digit natural number whose tens place is 3. Let A and B be the quotient of this number by 10 and the remainder of division by 10, respectively. If B multiplied by 10 plus A is 9 less than A multiplied by 10 plus B, what is the first number? Answer: Let's denote the two-digit number as \( XY \),...
Question: The teacher distributes chocolate to students evenly. There will be the following leftovers when each 6, 8, and 10 are distributed with an equal amount of candies: 4, 6, and 8. What is the minimum number of chocolates the teacher has? Answer: To solve this problem, we need to find the smallest number of choco...
Question: Two of the numbers 3, 5, and 9 were drawn and used only once to create the largest two-digit number. Find the number twice as large as the two-digit number you created. Answer: To create the largest two-digit number using two of the numbers 3, 5, and 9, we should use the largest digits in the tens and ones pl...
Question: Four friends want to eat food and split the money equally. If you ate 5 fish-shaped bread which is 200 won each and 7 hotteoks which is 800 won each, how much would each person pay? Answer: First, let's calculate the total cost of the food. The cost of the fish-shaped bread is: 5 fish-shaped bread x 200 won ...