Multiple choice

5 year ago, the ratio of age of A, B and C was 6 : 9 : 10. 10 years ago, the age of B is equal to age of A after 5 years. Find the present age of C. 5 वर्ष पूर्व, A, B और C की आयु का अनुपात 6 : 9 : 10 था । 10 वर्ष पूर्व, B की आयु A की 5 वर्ष बाद की आयु के बराबर है । C की वर्तमान आयु ज्ञात कीजिये ।

  1. 55

  2. 50

  3. 60

  4. 45

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A Correct answer
Explanation

5 years ago: A = 6k, B = 9k, C = 10k. Present: A = 6k+5, B = 9k+5, C = 10k+5. 10 years ago: B-10 = (A+5). So 9k+5-10 = 6k+5+5, giving 9k-5 = 6k+10, so 3k = 15 and k = 5. C's present age = 10(5)+5 = 55.