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OpenStudy (anonymous):

Two photocopying machines can produce 1000 copies in 1 hour. At the same rate, how many machines are needed to produce 4000 copies in 2 hours? Thanks!

OpenStudy (anonymous):

i think its 4, if 2 pm produce 1000 copies then 1 of them would produce 500 in one hour. 4000/2 = 2000 , 2000/500 = 4. 4 pm can produce 2000 cpoies in 1 hour so that they can produce 4000 in 2 hours, answer is 4.

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