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Help - Tough algebra problem

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Source: — Data Sufficiency |
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by miguelmickelberg » Mon Jan 31, 2011 3:20 pm
Oops... I could understand everything now. Can't understand how I couldn't figure this out before, haha. Thanks a lot anyway!
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by Anurag@Gurome » Mon Jan 31, 2011 9:45 pm
miguelmickelberg wrote:What is the value of 1/x + 1/y + 1/z?

(1) (xy + xz + yz)/xyz = 4
(2) x + y = 3
Statement 1: (xy + xz + yz)/xyz = 4
=> (xy/xyz) + (xz/xyz) + (yz/xyz) = 4
=> (1/z + 1/y + 1/x) = 4

Sufficient

Statement 2: No information about z.

Not sufficient

The correct answer is A.
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