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 is 15 years. The present age of the new boy is
Answer : Option D
Explanation : Sum of the present ages of four boys
= 9 × 4 + 20 = 56 years
Sum of the present ages of five boys
= 15 × 5 = 75 years
∴ Present age of new boy = 75 – 56 = 19 years
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