For 9 innings, Roman has an average of 70 runs. In the tenth inning, he scores 210 runs, thus increasing his average. His average increased by-

Question: For 9 innings, Roman has an average of 70 runs. In the tenth inning, he scores 210 runs, thus increasing his average. His average increased by-

Solution:
Total score for 9 innings = 70 × 9 = 630
Total score after 10th innings = 630 + 210 = 840
So, the new average is 840/10 = 84


So, the increment is 84 - 70 = 14