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Is m+z > 0? (1) m -3 z > 0. (2) 4z - m > 0

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Intern
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Joined: 25 May 2008
Posts: 41
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Is m+z > 0? (1) m -3 z > 0. (2) 4z - m > 0 [#permalink] New post 07 Sep 2008, 06:31
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is m+z > 0?

(1) m -3 z > 0.
(2) 4z - m > 0.
Current Student
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Joined: 11 May 2008
Posts: 559
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Kudos [?]: 20 [0], given: 0

GMAT Tests User
Re: DS [#permalink] New post 07 Sep 2008, 09:06
E.

try m=3 and z=-3. it does not satisfy any condition.
Intern
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Joined: 25 May 2008
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Re: DS [#permalink] New post 07 Sep 2008, 09:37
According to me it shud be E, but
OA is C.

FYI -its a gmatprep question.
Manager
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Joined: 14 Jan 2006
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Schools: HKUST
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Re: DS [#permalink] New post 07 Sep 2008, 10:43
kapilnegi wrote:
Is m+z > 0?

(1) m -3 z > 0.
(2) 4z - m > 0.


1 and 2 not sufficient
adding together,

m-3z+4z-m > 0 ; z > 0
if z > 0 , let z = 1
1.) m > 3
2.) 4 > m
i.e, 3 < m < 4
therefore, C
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Re: DS [#permalink] New post 07 Sep 2008, 11:45
kapilnegi wrote:
Is m+z > 0?

(1) m -3 z > 0.
(2) 4z - m > 0.


combine (1) and (2)
m -3 z + 4z - m >0
z>0
from (1) it is clear that m>0 when z>0

so m+z>0

C
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Re: DS   [#permalink] 07 Sep 2008, 11:45
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