Average salary of entire staff in an office is Rs., 500 per day. average salary of officers is Rs.,

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The average salary of the entire staff in an office is $Rs.\, 500$ per day. The average salary of officers is $Rs.\, 750$ and that of non-officers is $Rs. \,$ $250 .$ If the number of officers is $15,$ then find the number of nonofficers in the office?

A

$25$

B

$10$

C

$15$

D

$20$

Solution

Let the total no of non officer staff in an office $=x$

According to the question $750 \times 15+250 x=500(x+15)$

$500 x-250 x=11250-7500$

$250 x=3750 \Rightarrow x=\frac{3750}{250}=15$

Hence no of non-officer staff $=15$

Standard 13

Quantitative Aptitude

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