The average monthly salary of laborers and supervisors in a factory is Rs.1250 per month; where as the average monthly salary of 6 supervisors is Rs.2450. If the average monthly salary of the laborers is Rs.850 find the number of laborers?	Options.
A) 14 B) 15 C) 16 D) 17 E) 18
2450 850   \ /   1250   / \   400 1200   1:3   1--&gt;6   3--&gt;?   18   ANSW18R:18
<result>E</result>
The average monthly salary of laborers and supervisors in a factory is Rs.1250 per month; where as the average monthly salary of 6 supervisors is Rs.2450. If the average monthly salary of the laborers is Rs.850 find the number of laborers?