7. The average salary of all the workers in a workshop is Rs.8000. The average salary of 7 technicians is Rs.12000 and the average salary of the rest is Rs.6000. The total number of workers in the workshop is
A. 20 B. 21
C. 22 D. 23
Answer:
Let the toatl number of workers be x.
Then 8000x=(12000 x 7) + 6000 (x -7)
2000x =42000
x= 21.
