At present a father's age is 30 years more than that of his only son. What was his age when the son was born?

40 years
30 years
35 years
25 years

Correct Answer: 30 years

Explanation:

Suppose the age of son at present = P years
∴ Present age of the father = Present age of son + 30 years
Present age of the father = P + 30 years
Age of father at the birth of his son = Present age of the father - Present age of son = ( P + 30 ) – P = 30 years

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