A batsman scores - some runs in his 51st complete inning so that his average increases from 59.6 to 60. The runs scored by the batsman in his 51st inning are
1). 75
2). 70
3). 100
4). 80
Let the total runs scored in 51st innings be a.
Given,
Average runs scored in 50 innings = 59.6
Total runs scored in 50 innings = 59.6 × 50 = 2980
Given,
Average runs scored in 51 innings = 60
Total runs scored in 51 innings = 60 × 51 = 3060
Then,
⇒ a = 3060 - 2980
⇒ a = 80
∴ He scored 80 runs in his 51st innings.