A certain number of men can do a work in 20days. If there were 4 men less it could be finished in 5days more. How many men are there?	Choose the correct choice from the following options
A) 10 B) 20 C) 25 D) 30 E) 35

Rationale: the original number of men = 4 ( 20 + 5 ) / 5 = 20 men answer is b
Answer: B