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The average salary of all the workers in a workshop is ₹8000. The average salary of 7 technicians is ₹12,000 and the average salary of the rest is ₹6000. The total number of workers in the workshop is:

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

Correct answer: 21

Solution

Let the total number of workers be \(n\). Then total salary is \(8000n\). The 7 technicians earn \(7\times 12000=84000\), and the remaining \(n-7\) workers earn \(6000(n-7)\). Equating totals gives \(8000n=84000+6000(n-7)\), so \(n=21\).

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