The ratio of the age of a father to that of his son is 5:

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The ratio of the age of a father to that of his son is 5: 2. If the product of their ages in years is 1000, then the father's age (in years) after 10 years will be :

1. 50
2. 60
3. 80
4. 100

Correct Option: B

Let father’s age be 5x years.
Son’s age = 2x years
∴ 5x × 2x = 1000
⇒ x² = 100 ⇒ x = 10
∴ Father’s age after 10 years
= 5x + 10
= 5 × 10 + 10 = 60 years