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In a workshop the average monthly salary of all workers is Rs 8000. The 7 technicians earn an average of Rs 12,000, while the remaining workers earn an average of Rs 6000. What is the total number of workers in the workshop?

1. 20
2. 21
3. 22
4. 23

Correct answer: 21

Solution

Let N be the total number of workers. Then 8000N = 7*12000 + (N-7)*6000. Solving gives 2000N = 42000, so N = 21.

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