A scored 73, 76, 20 and 7 runs in four out of five innings. What should be his score in fifth innings. If he has to make an average of 55 run in five innings.

A. 99

B. 11

C. 55

D. 42

Answer: Option A

Solution(By Examveda Team)

Let average of 5^th inning is 'x'.
Average of five innings = 55   (Given)
$$\eqalign{ & \frac{{73 + 76 + 20 + 7 + x}}{5} = 55 \cr & 176 + x = 275 \cr & x = 275 - 176 \cr & \therefore \,x = 99 \cr} $$