It cost 5 men to work for 28 days. How many days will it cost 7 men?
Answer (1)
5 men can do the whole work in 28 days.
1 man can do the whole work in 28×5 = 140 days.
7 men can then do the whole work in 140/7 = 20 days . ;
5 men can do the whole work in 28 days.
1 man can do the whole work in 28×5 = 140 days.
7 men can then do the whole work in 140/7 = 20 days . ;
