The sum of the present ages of a father and his son is 60 years. Six years ago father's age was five times the age of the son After six years son's age will be

12 years

14 years

18 years

20 years

Let the present ages of son and father be x and (60 -x) years respectively.

Then, (60 - x) - 6 = 5(x - 6)

54 - x = 5x - 30

6x = 84

x = 14.

Son's age after 6 years = (x+ 6) = 20 years