30. Five years ago, the total of the ages of father and his son was 40 years. The ratio of their present ages is 4 : 1. What is the present age of the father
A.30 years B.25 years
C.20 years D.40 years
Answer: 40 years
Explanation: Let sons age = x. Then, fathers age = 4x.
(x - 5)+(4x - 5) = 40 ⇒ x = 10
Present age of father = 40 years.
