Average salary of all workers in a workshop is Rs., 12000 . average salary of 7 technicians is Rs.,

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The average salary of all workers in a workshop is $Rs.\, 12000 .$ The average salary of $7$ technicians is $Rs.\, 15000$ and the aterage salary of the rest in $Rs.\, 9000$. The total number of workers in the workshop is:

A

$12$

B

$13$

C

$14$

D

$15$

Solution

Let the Number of Remaining workers be $x$

$\frac{7 \times 15000+x \times 9000}{7+x}=12000$

$105000+9000 x=84000+12000 x$

$3000 x=21000$

$x=7$

Total workers be $7+7=14$

Standard 13

Quantitative Aptitude

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