After five years the age of a father will be thrice the age of his son whereas five years ago, he was seven times as old as his son was. What is father's present age?

35 years
40 years
45 years
50 years

Correct Answer: 40 years

Explanation:

Let son's age 5 years hence = x years
Then, father's age after 5 years hence = 3x years
∵ 7(x - 10) = (3x - 10)
⇒ x(7 - 3) = 70 - 80
⇒ x = 15
∴ Father's present age = (3x - 5) = 40 years

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