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From a class of 42 boys, a boy aged 10 y...

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

12 years 2 months

B

19 years

C

17 years

D

10 years 6 months

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The correct Answer is:
C
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