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if x, y, and z are integers greater than 1

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guest612
 Post subject: if x, y, and z are integers greater than 1
 Post Posted: Mon Aug 25, 2008 4:55 pm 
if x, y, and z are integers greater than 1, what is the value of x+y+z?

1) xyz=70
2) x/(yz) = 7/10

Can you please explain how the answer is A? I'm stumped.
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Genie
 Post subject: Use Prime Factorization:
 Post Posted: Mon Aug 25, 2008 7:20 pm 
The only way you could get a 70 is if the factors are 2,5 and 7.
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guest612
 Post subject: oops
 Post Posted: Mon Aug 25, 2008 9:00 pm 
thanks genie. i just realized i misread that all integers are greater than 1. oh my goodness.
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RonPurewal
 Post subject:
 Post Posted: Sun Sep 07, 2008 1:14 am 
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ManhattanGMAT Staff


Posts: 7146
yeah - make sure that you read the questions carefully. ESPECIALLY pay attention to information that appears in the question prompt, because that information must be true regardless of which statement you happen to be using.

they do love their prime factorizations.

finally, if a question appears to be ridiculously easy - if there are no restrictions on x, y, or z, then it's pretty clear that there's not enough information to find x + y + z - then you ought to give it a second look to make sure you aren't ignoring any salient information (as you did here).
you aren't going to nail 'em all, but you definitely don't want to blow problems just because you aren't reading them closely enough.
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