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.
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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.
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