| 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 [SSC (10+2) 2014] |
A) 20
B) 21
C) 22
D) 23
Correct Answer: B
Solution :
| Let total number of workers in workshop = x |
| Then, total salary of all workers \[=\text{ }8000\times x\] |
| According to the question, |
| \[\Rightarrow \] \[8000x=7\times 12000+(x-7)\times 6000\] |
| \[\Rightarrow \] \[8000x=84000+6000x-42000\] |
| \[\Rightarrow \] \[8000x-6000x=84000-42000\] |
| \[\Rightarrow \] \[2000x=42000\Rightarrow x=21\] |
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