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Source : GMATPrep Is m + z > 0 ? (1) m-3z > 0 (2) 4z-m

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Source : GMATPrep Is m + z > 0 ? (1) m-3z > 0 (2) 4z-m [#permalink]

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Source : GMATPrep

Is m + z > 0 ?

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

"You have to find it. No one else can find it for you." - Bjorn Borg

Kudos [?]: 688 [1], given: 1

1 KUDOS received
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Joined: 05 Jul 2006
Posts: 1742

Kudos [?]: 418 [1], given: 49

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Re: DS : m + z > 0 ? [#permalink]

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New post 10 Oct 2008, 10:17
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amitdgr wrote:
Source : GMATPrep

Is m + z > 0 ?....is m>-z

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


m>3z .......insuff ( consider when z is -ve)

from 2

m< 4z

insuff

both

add them together

-m< -3z , m<4z = z>0 ....thus both are suff ( C)

Kudos [?]: 418 [1], given: 49

VP
VP
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Joined: 30 Jun 2008
Posts: 1033

Kudos [?]: 688 [0], given: 1

Re: DS : m + z > 0 ? [#permalink]

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New post 10 Oct 2008, 10:29
yezz wrote:
amitdgr wrote:
Source : GMATPrep

Is m + z > 0 ?....is m>-z

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


m>3z .......insuff ( consider when z is -ve)

from 2

m< 4z

insuff

both

add them together

-m< -3z , m<4z = z>0 ....thus both are suff ( C)


OA is C.

Thanks Yezz. It never struck me that we can ADD the inequations as well :)

Thank you. +1 for you
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Kudos [?]: 688 [0], given: 1

SVP
SVP
User avatar
B
Joined: 05 Jul 2006
Posts: 1742

Kudos [?]: 418 [0], given: 49

GMAT ToolKit User
Re: DS : m + z > 0 ? [#permalink]

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New post 10 Oct 2008, 10:42
amitdgr wrote:
yezz wrote:
amitdgr wrote:
Source : GMATPrep

Is m + z > 0 ?....is m>-z

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


m>3z .......insuff ( consider when z is -ve)

from 2

m< 4z

insuff

both

add them together

-m< -3z , m<4z = z>0 ....thus both are suff ( C)


OA is C.

Thanks Yezz. It never struck me that we can ADD the inequations as well :)

Thank you. +1 for you


Just note that you can only add inequalities when the > or < is pointing in the same direction

Kudos [?]: 418 [0], given: 49

Re: DS : m + z > 0 ?   [#permalink] 10 Oct 2008, 10:42
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Source : GMATPrep Is m + z > 0 ? (1) m-3z > 0 (2) 4z-m

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