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Hi Kenneth, Your solution to the first problem is fine. For the second problem when you tell me "15 men can do a piece of work in 7 days" I wonder how big the job is. One measure is that it is 15 × 7 man days (the units are man × days). If you have 21 men to work on this job it will take (15 × 7 man days)/(21 men) = 5 days. This calculation of the size of the job is exactly what you would do if you were a contractor. You are going to hire some men for this job and you need to know how much it will cost you. It will cost you 15 × 7 man days and if you know how much you pay per day you can get an answer in dollars. If you have 21 men to work on the job you cakenneth n complete it sooner but it still costs you 15 × 7 man days. I hope this helps, | ||||||||||||
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