18 typists, all working with the same speed, type a certain number of pages in 30 days, working 8 hrs a day. find how many hours per day must 10 typists work in order to type the same number of pages in 12 days
Job = 18 typ x 30 days x 8 hrs / day = 4320 typist hours
10 typist x 12 days = 120 typist days
4320 typist hours / 120 typist days = 36 hours per day (not possible)