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Question

The average salary of all the workers in factory is 7000. The average salary of 9 mechanic is 5000 and for the rest of the workers it 4000. Find the total number of workers in the factory. a

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Solution

Let x be the total worker in the factory.
The average salary of all worker in factory is 7000
The total salary of all worker =7000x
The average salary of 9 mechanic is 5000
Total salary of 9 worker =9×5000=45000
Total salary of rest of worker =4000(x9)
7000x=45000+4000(x9)
7x=45+4(x9)
7x=45+4x36
3x=9
x=3
Total worker =x+9=3+9=12

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