What will be the Present Age of New Boy? If

The average age of four boys five years ago was 9 years. On including a new boy. the present average age of all the five becomes 15 years. The present age of the new boy is

  1. 14 years
  2. 6 years
  3. 15 years
  4. 19 years
Monis Rasool Professor Asked on 10th June 2015 in Maths.
Add Comment
  • 1 Answer(s)

    Answer: (4) 19 years
    Explanation:-

    The average of four boys five years ago = 9 years
    Then, the present age of boys = 9 x 4 + 5 x 4 = 36 + 20
    = 56 years
    the average age of five members   = 15
    the sum of their ages = 15 x 5 = 75
    The age of the new boy = 75 – 56 = 19 years

    Hence, the age of the new boy is 19 years.

    Anurag Mishra Professor Answered on 11th June 2015.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.