42 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?	Options:
A) 28 B) 77 C) 36 D) 25 E) 13

Rationale: "explanation : less men , means more days { indirect proportion } let the number of days be x then , 27 : 42 : : 18 : x [ please pay attention , we have written 27 : 42 rather than 42 : 27 , in indirect proportion , if you get it then chain rule is clear to you : ) ] { \ color { blue } x = \ frac { 42 \ times 18 } { 27 } } x = 28 so 28 days will be required to get work done by 27 men . answer : a"
Answer: A