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GMATprep DS

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Director
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Joined: 29 Aug 2005
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GMATprep DS [#permalink]

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New post 10 Apr 2009, 12:44
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A
B
C
D
E

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Manager
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Re: GMATprep DS [#permalink]

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New post 10 Apr 2009, 18:44
IMO D.

rewriting question stem: |x-z|=|z|-|x| ?

stmnt1 - z<x, which means y>0 and x<0 and z<0.
picking numbers will show you that the question stem is always true
sufficient

stmnt 2 - y>0, which means x<0 and z<0
same as stmnt 1
sufficient

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Senior Manager
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Re: GMATprep DS [#permalink]

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New post 10 Apr 2009, 18:59
Given
then |x-z| + |x| = |z|

the above eqn will hold good only when z<x<0

Stmt 1 :
z < x then y needs >0 and z and x < 0 for zy<xy <0 . Hence sufficient
Stmt 2:

y >0 then x<z<0 for zy<xy <0 . Hence sufficient

Ans D

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Current Student
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Re: GMATprep DS [#permalink]

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New post 11 Apr 2009, 03:54
Outcome of the result will depend on

zy-xy<0 so each one is suff.

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Re: GMATprep DS [#permalink]

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New post 11 Apr 2009, 17:17
tkarthi4u wrote:
Given
then |x-z| + |x| = |z|

the above eqn will hold good only when z<x<0


The equation is not 'only' true when z < x < 0. It's also true if 0 < x < z. This is one of the strangest questions in GMATPrep, because you don't even need the statements to answer the question -- if zy < xy < 0, the answer to the question is certainly 'yes'.
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Re: GMATprep DS [#permalink]

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New post 12 Apr 2009, 07:09
I also had the same feeling about this question.
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Re: GMATprep DS   [#permalink] 12 Apr 2009, 07:09
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