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From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this change, the average age of the boys in that class increases by 2 months, the age of the newcomer is :

A. 19 years B. 17 years C. 10 years 6 months D. 12 years 2 months Answer: Option B
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Solution(By Apex Team)

According to the question, Due to newcomer average age is increased by = 2 months Total age increment in 42 boys = 42 × 2 = 84 months or 7 years Note : If the age of newcomer is same as the boy which was replaced then there is no effect on 2 months. ∴ Age of new boy = 10 + 7 = 17 years

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