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1 .
The average salary of all the workers in a workshop is Rs. 8,000. The average salary of 7 technicians is Rs.12,000 and the average salary of the rest is Rs. 6,000. The total number of workers in the workshop is :
[ A ]    21 right
[ B ]    20
[ C ]    23
[ D ]    22
[ E ]    None of these
Answer : Option A
Explanation :
Let the total no. of workers be x.
Now, 8000 x = 7 $\times$ 12000 + (x - 7) $\times$ 6000
x = $42000 \over 2000$ = 21

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