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RRB Junior Engineer / DMS / CMA 2019 · Question 49 of 3719

Average age of 3 children born at intervals of 2 years is 8. How old is the eldest child?

Mathematics - Ages

  1. Aa. 12 years
  2. Bb. 7 years
  3. Cc. 8 years
  4. Dd. 10 yearsCorrect

Answer: D. d. 10 years

Explanation

Let the age of three children are x, (x + 2) and (x + 4) The average age of 3 children = 8. According to the question [x + x + 2 + x + 4] = 3 x 8 3x + 6 = 24 3x = 24-6 3x = 18 x=6 Age of the eldest son = 6 + 4 = 10 years.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary

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