Five years ago, the total of the ages of a father and his son was 40 years. The ratio of their present ages is 4 : 1. What is the present age of the father?
30 years
20 years
25 years
None of these
Explanation:
Let sons age = x. Then fathers age = 4x
(x-5)+(4x-5)=40 ⇒⇒ x = 10
Present age of father = 40 years
Let sons age = x. Then fathers age = 4x
(x-5)+(4x-5)=40 ⇒⇒ x = 10
Present age of father = 40 years