If 3 men can complete a work in 10 days, how many days will it take for 5 men to complete the same work?
Answer: A. 6 days
If 3 men complete the work in 10 days, their combined work rate is 3/10. For 5 men, the work rate is 5/10 = 1/2, so they will complete the work in 2 days.