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Quantitative Aptitude

Averages

The average s...

Question

The average salary of all the workers in a workshop is Rs. 9000. The average salary of 9 technicians is Rs.12000 and the average salary of the rest is Rs.4500. The total number of workers in the workshop is

A

10

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B

11

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C

13

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D

15

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Solution

The correct option is D
15

Let the total number of workers be x.

Then, 9000x = (12000 $\times$ 9) + 4500(x – 9)

$⟹$ 4500x = 67500

$⟹$ x = 15

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