The average salary of all the workers in a workshop is $8000. The average salary of 7 technicians is $12000 and the average salary of the rest is $6000. The total number of workers in the shop is?
Choose one:
A) 15
B) 18
C) 21
D) 25
E) 31
Let the total number of workers be x   8000x = 12000*7 + 6000(x-7)   x = 21   Answer is 21
<result>C</result>
The average salary of all the workers in a workshop is $8000. The average salary of 7 technicians is $12000 and the average salary of the rest is $6000. The total number of workers in the shop is?