36 men can complete a piece of work in 18 days. In how many days will 81 men complete the same work ?
Choose the correct choice from the following answers:
A) 8 B) 77 C) 88 D) 29 E) 21

Rationale: "explanation : less men , means more days { indirect proportion } let the number of days be x then , 81 : 36 : : 18 : x x = 8 answer : a ) 8 days"
Answer: A