The average age of four brothers is 12 years. If the age of their mother is also included, the average is increased by 5 years. The age of the mother (in years) is :

A. 37 years

B. 43 years

C. 48 years

D. 53 years

Answer: Option A

Solution(By Examveda Team)

Sum of age of four brothers = 12 × 4 = 48
Sum of age of four brothers and their mother
= 17 × 5 = 85
∴ Mother's age = 85 - 48 = 37 years