30 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?  Pick.
A) 20  B) 77  C) 36  D) 25  E) 13
Explanation:   Less Men, means more Days {Indirect Proportion}   Let the number of days be x   then,   27 : 30 :: 18 : x   [Please pay attention, we have written 27 : 30 rather than 30 : 27, in indirect proportion, if you get it then chain rule is clear to you :)]   {\color{Blue} x=\frac{30\times 18}{27}}   x = 20   So 20 days will be required to get work done by 27 men.   20nswer: 20
<result>A</result>
30 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?