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4.Average
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The average salary per head of all workers of an institution is $Rs. \,60\,.$ The average salary per head of $12$ officers is $Rs. \,400 .$ The average salary per head of the rest is $Rs.$ $56 .$ Then, the total number of workers in the institution is?
A
$1030$
B
$1032$
C
$1062$
D
$1060$
Solution
Let the total number of workers $=x$
According to the question
$60 x=12 \times 400+56(x-12)$
$60 x-56 x=4800-672$
$4 x=4128 \Rightarrow x=1032$
Standard 13
Quantitative Aptitude
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