Question: a certain number of men can do a work in 20 days . if there were 4 men less it could be finished in 5 days more . how many men are there ?
A) 10
B) 20
C) 25
D) 30
E) 35
Correct answer: B
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.3