Explanation:

Let the average be x.

Sum of scores of innings be 10x.

In eleventh innings he scored 108 runs.

So, Sum of scores after 11 innings = 10x + 108 .

Average = 10 x + 108 / 11.

According to the question, Average is increased by 6 .

x + 6 = 10x + 108 / 11

11 ( x + 6 ) = 10 x + 108

11x + 66 = 10x + 108

11x - 10x = 108 - 66

x = 42

So, New average = x + 6 = 42 + 6 = 48 .

Hence, option 1 is the correct answer.