Average salary of entire staff in a office is Rs., 120 per month. average salary of officers is Rs.,

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The average salary of the entire staff in a office is $Rs.\, 120$ per $month.$ The average salary of officers is $Rs.\, 460$ and that of non-officers is $Rs. \,$ $110 .$ If the number of officers is $15,$ then find the number of non-officers in the office ?

A

$610$

B

$510$

C

$410$

D

$310$

Solution

let the number of non-officer staff in the office $=x$

$15 \times 460+x \times 110=(x+15) 120$

$120 x-110 x=6900-1800 \quad 10 x=5100 \Rightarrow x=510$

No of non-officer staff in the office $=510$

Standard 13

Quantitative Aptitude

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