A group of men decided to do a work in 55 days, but 15 of them became absent. If the rest of the group did the work in 60 days, Find the original number of men?	Choose the correct choice from the following answers.
A) 180  B) 150  C) 140  D) 100  E) 25

Rationale: "original number of men = 15 * 60 / ( 60 - 55 ) = 180 answer is a"
Answer: A