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- Quantitative Aptitude
4.Average
medium
The average age of $35$ students in a class is $16\, years.$ The average age of $21$ students is $14$ What is the average age of remaining $14$ students ?(in $years$)
A
$15$
B
$17$
C
$18$
D
$19$
Solution
Average age of $35$ students $=16$
Average age of $21$ students $=14$
$\therefore$ Average age of remaining $14$ students $=\frac{35 \times 16-21 \times 14}{14}$
$=5 \times 8-21=40-21=19$ years
Standard 13
Quantitative Aptitude