13. 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:
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let the no. of workers be x
average salary of total workers =8000
average salary of 7 tech. =12000
rest workers average salary=6000
to solve this we should take
technician's total salary+rest workers total salary-total salary of all workers=0
12000×7+(x-7) 6000-8000x=0
84000+6000x-42000-8000x=0
42000-2000x=0
x=21
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