1 .	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 –
[ A ]    15 years [ B ]    19 years [ C ]    14 years [ D ]    6 years
Answer : Option B Explanation : ATQ, Five year ago, average age of 4 boys = 9 years The present average age of 4 boys = 9 + 5 = 14 years So, the age of new boy = (15 + 4 × 1) years = (15 + 4) years = 19 years
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