The average age of a class of 6 girls is x years. Four new girls having ages x - 2, x + 2, x + 4 and x + 6 join the class. What is the new average age (in years) of the class?

A. x + 1

B. x + 2

C. 2 + 5x

D. x + 2.5

Answer: Option A

Solution(By Examveda Team)

Total age of a class of 6 girls = 6x
Four new girls ages = 4x + 10
Average age of 10 girls
$$\eqalign{ & = \frac{{10x + 10}}{{10}} \cr & = x + 1 \cr} $$