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# Source: GMATPrep If xyz>0, is x > 0? (1) xy>0 (2)

Author Message
Manager
Joined: 21 Sep 2006
Posts: 101
Location: Where you mind is
Source: GMATPrep If xyz>0, is x > 0? (1) xy>0 (2)  [#permalink]

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21 Sep 2007, 20:43
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions

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Source: GMATPrep

If xyz>0, is x > 0?

(1) xy>0
(2) xz >0

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

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

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SVP
Joined: 29 Mar 2007
Posts: 2409
Re: DS: xyz > 0  [#permalink]

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22 Sep 2007, 00:07
Hang Tuah wrote:
Source: GMATPrep

If xyz>0, is x > 0?

(1) xy>0
(2) xz >0

I say C.

S1:

xy>0 well this is not help b/c x and y can both be negative or both be positive. Insuff.

S2: xz>0 same reasoning as in S1.

S1&S2: with this we know the xy>0, xz>0 and xyz>0. in xyz>0 only two numbers can be negative or all are positive.

With S1 and S2 individually, we could have situations were x*y and x*z are both negative or both positive.

However, if we take these together and say both are negative then combined w/ xyz>0 this is not possible.
Manager
Joined: 27 Aug 2007
Posts: 248

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22 Sep 2007, 07:16
1
another one for C,

1) xy>0, both - or + INSUFF
2) xz>0, both - or + INSUFF

together, from the first statement z>0 so in second x>0

Ans: C

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

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

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

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Non-Human User
Joined: 09 Sep 2013
Posts: 9836
Re: Source: GMATPrep If xyz>0, is x > 0? (1) xy>0 (2)  [#permalink]

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16 Oct 2018, 03:15
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Source: GMATPrep If xyz>0, is x > 0? (1) xy>0 (2)   [#permalink] 16 Oct 2018, 03:15
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