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# DS : Number Line

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VP
Joined: 30 Jun 2008
Posts: 1019
DS : Number Line [#permalink]

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10 Oct 2008, 09:36
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Please help.

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

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

Intern
Joined: 09 Oct 2008
Posts: 23
Re: DS : Number Line [#permalink]

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10 Oct 2008, 09:58
Answer is C

Basically the question is asking whether r = -s. If r = -s, then middle between -s and s is 0.

1) 0 < s.
nothing about r, so (INSUFFICIENT)

2) distance(r, t) = distance (-s, t)
case 1: if s is postive, -s must be left of s, then r = -s.
Then the answer to the question is YES (0 is mid point between r & s)
case 2: if s is negative, -s must be right of s,
Then the answer to the question is NO

Therefore, 2) is also INSUFFICIENT

Now if (1) & (2) are combined, (1) suggest that s is a postive, which makes ONLY case 1 in (2) true. NOW (1) and (2) combined, we know they are SUFFICIENT
Senior Manager
Joined: 21 Apr 2008
Posts: 265
Location: Motortown
Re: DS : Number Line [#permalink]

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31 Oct 2008, 17:52
C

Stmt1:In Suff
Stmt2: -s to could be to the right side of t - In Suff

Together: Suff
s is positive and r is at -s
Manager
Joined: 09 Jul 2008
Posts: 109
Location: Dallas, TX
Schools: McCombs 2011
Re: DS : Number Line [#permalink]

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31 Oct 2008, 21:07
Simple, but tricky. Almost picked B for this. But, 2) leads to two possibilities: 0 can be left or right of S.

Answer: C
Intern
Joined: 25 Sep 2008
Posts: 9
Re: DS : Number Line [#permalink]

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31 Oct 2008, 21:55
Please help me understand how stm2 is not sufficient

i am a beginner ... hope this is not a dumb question
Intern
Joined: 31 Oct 2008
Posts: 31
Re: DS : Number Line [#permalink]

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31 Oct 2008, 22:02
Without (I), r and s could both be 0.

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

This is not a quality discussion. It has been retired.

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

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: DS : Number Line   [#permalink] 31 Oct 2008, 22:02
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# DS : Number Line

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