The sum of the present ages of a father and his son is 60 years. five years ago, father's age was four times the age of the son. so now the son's age will be

A. 5

B. 10

C. 15

D. 20

Correct Answer :

C. 15

Let the present ages of son and father be x and (60 -x) years respectively. Then, (60 - x) - 5= 4(x - 5) 55 - x = 4x - 20 5x = 75 x = 15