Average salary of all workers in a workshop is Rs.,8000. average salary of 7 technicians is Rs., 120

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The average salary of all the workers in a workshop is $Rs.\,8000.$ The average salary of $7$ technicians is $Rs.\, 12000$ and the average salary of the rest is $Rs.\,6000 .$ The total number of workers in the workshop is

A

$20$

B

$21$

C

$22$

D

$23$

Solution

Let the total number of workers be $x$.

Number of workers except technician $=x-7$

$8000 x=7 \times 12000+(x-7) 6000$

$(8000-6000) x=7 \times 12000-7 \times 6000$

$2000 x=7 \times 6000$

$x=\frac{7 \times 6000}{2000}=21$

Standard 13

Quantitative Aptitude

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