Add example solution

README.md

@@ -14,4 +14,14 @@ This dataset is designed to teach LLM how to solve basic arithmetic problems.
 |`type`|Type of numbers in the problem|
 |`range`|Range of numbers (-N...N) used in the problem|
 
-If problem contains an error (e.g. division by zero), `answer` equals "error".
+If the problem contains an error (e.g. division by zero), `answer` equals "error".
+
+Example solution:
+
+```
+find 10 * 9 - 10 + 4
+step 10 * 9 = 90
+step 90 - 10 = 80
+step 80 + 4 = 84
+answer 84
+```