Question

A cricketer has a certain average in 9 innings. In the tenth inning he scores 60 runs, thereby increases his average by 5 runs. What is his new average?

Answer 1

Let Ajit's average be x for 9 innings. So, Ajit scored 9x run in 9 innings.

In the 10th inning, he scored 100 runs then average became (x+8).

And he scored (x+8)*10 runs in 10 innings.

Now,

⇒9x+100=10×(x+8)

9x+100=10x+80

x=100−80

x=20

New average=(x+8)

                      =28runs