The average monthly salary of the workers in a workshop is Rs. 8500. If the average monthly salary of 7 technicians is Rs. 10000 and average monthly salary of the rest is Rs. 7800, the total number of workers in the workshop is
A18
B20
C22
D24
Answer:
C. 22
Explanation:
Let the total number of workers be x.
Then (7 x 10000) + (x - 7) * 7800 = 8500 x
=> 70000 + 7800x - 54600
=> 8500x
=> 700x = 15400
=> x = 22