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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 :
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- 19 years
- 17 years
- 10 years 6 months
- 12 years 2 months
- 19 years
Correct Option: B
According to question ,
Total increase = 2 × 42
| Age of new boy = |  | 10 + | 2 × 42 |  | = 17 years |
| 12 |
