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GMAT prep PS question

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GMAT prep PS question [#permalink]

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New post 22 Feb 2009, 00:54
00:00
A
B
C
D
E

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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Re: GMAT prep PS question [#permalink]

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New post 22 Feb 2009, 01:07
is C the right answer?
I would have said E.

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Re: GMAT prep PS question [#permalink]

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New post 22 Feb 2009, 01:09
BuddaBelly wrote:
i tried searching this but couldn't find it. Please include an explaination? I dunno how this works! Thanks!

Image


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
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Re: GMAT prep PS question [#permalink]

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New post 22 Feb 2009, 01:20
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

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Re: GMAT prep PS question [#permalink]

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New post 22 Feb 2009, 09:04
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

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Re: GMAT prep PS question   [#permalink] 22 Feb 2009, 09:04
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