What is The Age of The Youngest Boy?

The sum of ages of 3 boys is 81 years. If all the boys were born at an equal interval of 6 years, then what is the age of the youngest boy?

  1. 23 years
  2. 21 years
  3. 22 years
  4. 24 years
Anurag Mishra Professor Asked on 7th September 2015 in Maths.
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  • 1 Answer(s)

    Answer: (2) 21 years

    Explanation:-
    The sum of ages of 3 boys = 81 years

    If all the boys were born at an equal interval of 6 years,
    Let the ages of the boys be X, X + 6 and X + 12.
    Then, X + X + 6 + X + 12 = 81
    3 X + 18 = 81
    3 X  = 81 – 18
    X = 63/3
    X = 21 years

    Then, the age of the youngest boy is X = 21 years.

    Hence, the answer is (2) 21 years.

    Anurag Mishra Professor Answered on 9th September 2015.
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