A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17 innings:

🧠 Explanation:

A batsman scores 87 runs in his 17th inning, raising his average by 3 to 39. Solve: total runs after 16 innings = 16 × 36 = 576. After 17th, total = 17 × 39 = 663, so 87 runs fits. This teaches average calculations for students.