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The average monthly salary of the workers in a workshop is Rs. 8,500. If the average monthly salary of 7 technicians is Rs. 10,000 and average monthly salary of the rest is Rs. 7,800, the total number of workers in the workshop is
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- 18
- 20
- 22
- 24
- 18
Correct Option: C
Let the number of workers be n.
According to the question,
7 × 10000 + (n – 7) 7800 = n × 8500
⇒ 700 + 78x – 78 × 7 = 85n
⇒ 85n – 78n = 700 – 546
⇒ 7n = 154
⇒ n = 154 ÷ 7 = 22
