The average age of mother and her six children is 12 years, which is reduced by 5 years if the age of mother is excluded. The age of the mother (in years) is :

A. 40

B. 50

C. 42

D. 48

Answer: Option C

Solution(By Examveda Team)

Mother + 6 children
= 12 × 7
= 84 years
6 children = 6 × 7 = 42 years
∴ Age of mother = 42 years