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4.Average
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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
A
$14$ years and $8$ months
B
$15$ years
C
$16$ years and $4$ months
D
$17$ years and $10$ months
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.
Standard 13
Quantitative Aptitude
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