0 vote
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 :
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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 :
1). 19 years
2). 17 years
3). 10 years 6 months
4). 12 years 2 months
2 answers
1 vote
$10 + \frac{(2 \times 42)}{12} =17years $
2 vote
it from previous year ssc papers, option 2 is the right answer