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- Quantitative Aptitude
4.Average
medium
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
Solution
Total decrease $=(20 \times 2)$ months
$=3$ years $4$ months
$\therefore$ Age of the new boy $=18$ years $-$ $3$ years 4 months
$=14$ years $8$ months.
Std 13
Quantitative Aptitude
