A cricketer has an average of 30 runs in 9 innings. In the 10th inning, he scores some runs, and his average increases to 31 runs. How many runs did he score in the 10th inning?
Show answer & explanation
Correct answer: D
Explanation
Total runs in 9 innings = 9 × 30= 270
Total runs in 10 innings = 10 × 31= 310
Runs scored in the 10th inning = 310 − 270= 40