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Railways PYQCBT 1 2016

RRB NTPC · Question 82

After five years, Mayank's age will be 3/5th of his father's age. Five years ago their age ratio was 2 : 5. Find the present age of Mayank. A. 17 B. 13 C. 19 D. 15

  1. D

  2. C

  3. B

  4. A

Show answer & explanation

Answer: (C) B

Explanation

(M + 5) = 3/5 (F + 5) and (M − 5)/(F − 5) = 2/5. From the second, F = (5M − 15)/2. Substituting: 5M + 10 = 3(5M − 15)/2, so 10M + 20 = 15M − 45 and M = 13.