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1. The average monthly salary of 660 workers in a factory is Rs. 380. The average monthly salary of officers is Rs. 2100 and the average monthly salary of the other workers is Rs. 340. Find the number of other workers.

A. 645

B. 650

C. 640

D. 642

Solution:

\begin{aligned} Total salary of 660 workers \\ = 660 \times 380 \\ = R s . 250800 \\ If other workers be x; then, \\ = [(660 - x) \times 2100] + 340 x \\ = 250800 \\ O r, 1386000 - 2100 x + 340 x = 250800 \\ 1760 x = 1135200 \\ Hence, x = \frac{1135200}{1760} = 645 \\ Number of other workers = 645 \end{aligned}

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