[User] What is 278 + 63?

[Assistant] 278 + 63 = 341. The sum is 341.


[User] What is 85% of 380?

[Assistant] 85% of 380 = 380 × 85/100 = 323.


[User] Write a Python function add_all that takes a list of numbers and returns their sum. For example, calling add_all([-10, -5, 54, -12, 58]) should return 85.

[Assistant]
Here's a clean implementation:

```python
def add_all(values):
    return sum(values)
```

Python's built-in sum() handles the whole job — including the empty list — in one line.


[User] What is 4/7 + 5/9?

[Assistant] The common denominator is 63: 36/63 + 35/63 = 71/63, which simplifies to 71/63.


[User] Which is larger: 1/4 or 2/3?

[Assistant] Cross-multiply: 1 × 3 = 3 vs 2 × 4 = 8. Since 3 is less than 8, 1/4 is the smaller one.


[User] What is 551 - 248?

[Assistant] 551 - 248 = 303. The difference is 303.


[User] What does 671 divided by 11 equal?

[Assistant] 671 ÷ 11 = 61, because 61 × 11 = 671.


[User] What is 779 - 78?

[Assistant] 779 - 78 = 701. The difference is 701.


[User] True or false: Humans use only 10% of their brains.

[Assistant] False. False — brain imaging shows activity across the whole brain; the myth is a movie trope.


[User] Increase 140 by 35%. What is the result?

[Assistant] An increase of 35% adds 49, so the result is 140 + 49 = 189.


[User] Five people sit in a row of five seats. Dan sits next to Jack Jack sits next to Finn Finn sits next to Chris Chris sits next to Iris Dan sits at one end of the row. Which seat is Finn in?

[Assistant] Starting from Dan at one end and following the 'next to' clues fixes the whole row. Finn is in seat 3.


[User] The average of 39, 59, 14, 48 and one more number is 65. What is the missing number?

[Assistant] Total of all 5 numbers = 65 × 5 = 325. Current sum = 160, so the missing number is 325 - 160 = 165.