13. The average salary of workers o...
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13. The average salary of workers of a factory is 6000. The average salary of 15 technicians is 12000 and that of non-technicians is 3750. Find the total number of workers in the factory. (1) 40 (2) 25 (3) 35 (4) None of these

11th - 12th Class
Maths
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13. (4) Let there are ( x ) non-technicians in the factory. Then, according to the question, ( (15 times 12000+x times 3750)=(15+x) times 6000 ) ( Rightarrow quad 180000+3750 x=90000+6000 x ) ( Rightarrow ) [ begin{aligned} 2250 x &=90000 x &=40 end{aligned} ] ( Rightarrow ) Thus, total number of workers in the factory is ( 40+15, ) i.e. 55
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