Mathematics, 09.10.2019 06:00 carlinryan
Working simultaneously at their respective constant rates, machines a and b produce 800 nails in x hours. working alone at its constant rate, machine a produces 800 nails in y hours. in terms of x and y, how many hours does it take machine b, working alone at its constant rate, to produce 800 nails?
(a) x/(x+y)(b) y/(x+y)(c) xy/(x+y)(d) xy/(x-y)(e) xy/(y-x)
Answers: 1
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