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# GMAT prep PS question

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Manager
Joined: 11 Sep 2008
Posts: 56

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22 Feb 2009, 01:54
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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i tried searching this but couldn't find it. Please include an explaination? I dunno how this works! Thanks!

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Manager
Joined: 09 Nov 2008
Posts: 148
Re: GMAT prep PS question [#permalink]

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22 Feb 2009, 02:07
I would have said E.
SVP
Joined: 04 May 2006
Posts: 1783
Schools: CBS, Kellogg
Re: GMAT prep PS question [#permalink]

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22 Feb 2009, 02:09
BuddaBelly wrote:
i tried searching this but couldn't find it. Please include an explaination? I dunno how this works! Thanks!

xy+z=x(y+z)
xy+z=xy+xz
z=xz
z(1-x)=0
z=0 or x=1

E is should be OA
_________________
Manager
Joined: 11 Sep 2008
Posts: 56
Re: GMAT prep PS question [#permalink]

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22 Feb 2009, 02:20
yeah OA is E.

I can't believe i missed that. i was plugging in numbers...

sondenso wrote:
xy+z=x(y+z)
xy+z=xy+xz
z=xz
z(1-x)=0
z=0 or x=1

E is should be OA
Manager
Joined: 27 May 2008
Posts: 192
Re: GMAT prep PS question [#permalink]

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22 Feb 2009, 10:04
No need to substitute number for this

xy +z = x(y+z)

xy + z = xy + xz

xz - z = 0

z(x-1)=0

So either z or x-1 = 0

so E

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: GMAT prep PS question   [#permalink] 22 Feb 2009, 10:04
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# GMAT prep PS question

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