In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years in replaced by a new boy. The age of the new boy is:

14 years and 8 months

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15 years

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16 years 4 months

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17 years 10 months

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None of these

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Solution

The correct option is A 14 years and 8 months
Total decrease = $(20 \times 2)$ months
= 3 years 4 months
$∴$ Age of the new boy = 18 years - 3 years 4 months
= 14 years 8 months.

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In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years in replaced by a new boy. The age of the new boy is:

The correct option is A 14 years and 8 monthsTotal decrease = (20×2) months = 3 years 4 months ∴ Age of the new boy = 18 years - 3 years 4 months = 14 years 8 months.

The correct option is A 14 years and 8 months
Total decrease = $(20 \times 2)$ months
= 3 years 4 months
$∴$ Age of the new boy = 18 years - 3 years 4 months
= 14 years 8 months.