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If two copying machines work simultaneously at their [#permalink]

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28 Jan 2012, 04:01

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A

B

C

D

E

Difficulty:

25% (medium)

Question Stats:

65% (01:29) correct
35% (00:38) wrong based on 215 sessions

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If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes? (1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

Straight E, though a little bit tricky. All we need to know is the rates of these machines. Though from both statement the rates can be: 250 copies per minute and 500 copies per minute; 250 copies per minute and 125 copies per minute.

Re: If two copying machines work simultaneously at their [#permalink]

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25 Jul 2016, 09:41

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