Multiple choice

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 - एक पिता की आयु का उसके पुत्र की आयु से अनुपात 5 : 2 है । यदि उनकी आयुओं का वर्षो में गुणनफल 1000 हो, तो 10 वर्ष के उपरांत पिता की आयु (वर्षो में) होगी-

  1. 50

  2. 55

  3. 60

  4. 75
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the father's age be 5x and the son's age be 2x. The product of their ages is 5x × 2x = 10x² = 1000, which gives x² = 100 and x = 10. So the father's current age is 5 × 10 = 50 years. After 10 years, the father's age will be 50 + 10 = 60 years. Option A (50) is the father's current age, not after 10 years.

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