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Copying machines

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Copying machines

by crackgmat007 » Wed May 13, 2009 9:02 pm
6: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.

Are two statements together not sufficient (C)? How is it E?
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Source: — Data Sufficiency |
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by aj5105 » Wed May 13, 2009 9:53 pm
This is how it is IMO:

When you consider (1) + (2), You still get two options.

(a) 250 per minute and 500 per minute

(b) 250 per minute and 125 per minute

So, you do not know what rates the machines are working on.

Hence (E)
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