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Expert replies
by likewhoa » Mon Nov 26, 2007 7:36 am
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


answer: E
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Source: — Data Sufficiency |

Re: 1

by projase » Wed Nov 28, 2007 3:46 am
likewhoa wrote: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


answer: E
If one reads fast it is easy to get trapped with this question. The problem with statement 2 is that one doesn't know wich machine is the faster, so if one combines the two statements there are two posible solutions (250, 125) or (250, 500).
Where there's a will, there's a way...
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