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# DS Geometery.JPG

Author Message
Director
Joined: 20 Sep 2006
Posts: 639

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21 Sep 2008, 18:38
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 sessions

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DS Geometery.JPG [ 15.04 KiB | Viewed 1018 times ]

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

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Senior Manager
Joined: 28 Feb 2007
Posts: 296
Re: DS - number line [#permalink]

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22 Sep 2008, 00:59
C.
st1) doesn't give any info about r. r can any + or - #. Insuff.
st2) at least 2 options are possible: r=-s or r,s,t are all negative #s. Insuff.

1+2 st) r=-s and 0 is between r and s.
SVP
Joined: 17 Jun 2008
Posts: 1504
Re: DS - number line [#permalink]

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22 Sep 2008, 01:16
IMO B.

From II, t-r = t - (-s) or -r = s....hence sufficient.
Director
Joined: 20 Sep 2006
Posts: 639
Re: DS - number line [#permalink]

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26 Sep 2008, 21:42
OA is C ... still confused ...
SVP
Joined: 07 Nov 2007
Posts: 1760
Location: New York
Re: DS - number line [#permalink]

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27 Sep 2008, 00:13
1
KUDOS
rao_1857 wrote:
OA is C ... still confused ...

should be C..

B is not the answer two possibilities.

Graphical approach:
See below for graphical approach.
s and t are positive-- in this case s=-r
<-----r----0---s-----t-->
s and t are -ve ... inthis case s<>-r (zero is not mid point)
<-----r----s----t----0-(-s)--->

Mathematical approach:

When we talk about distance.. don't forget Mod..

|t-r|=|t+s|
--> multiple solutions

when you combine (1) and (2)
t and s are +ve .
r=-s
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SVP
Joined: 17 Jun 2008
Posts: 1504
Re: DS - number line [#permalink]

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28 Sep 2008, 05:32
x2suresh wrote:
rao_1857 wrote:
OA is C ... still confused ...

should be C..

B is not the answer two possibilities.

Graphical approach:
See below for graphical approach.
s and t are positive-- in this case s=-r
<-----r----0---s-----t-->
s and t are -ve ... inthis case s<>-r (zero is not mid point)
<-----r----s----t----0-(-s)--->

Mathematical approach:

When we talk about distance.. don't forget Mod..

|t-r|=|t+s|
--> multiple solutions

when you combine (1) and (2)
t and s are +ve .
r=-s

Good catch. Graph made everything crystal clear.
Director
Joined: 20 Sep 2006
Posts: 639
Re: DS - number line [#permalink]

### Show Tags

02 Oct 2008, 06:53
1
KUDOS
x2suresh wrote:
rao_1857 wrote:
OA is C ... still confused ...

should be C..

B is not the answer two possibilities.

Graphical approach:
See below for graphical approach.
s and t are positive-- in this case s=-r
<-----r----0---s-----t-->
s and t are -ve ... inthis case s<>-r (zero is not mid point)
<-----r----s----t----0-(-s)--->

Mathematical approach:

When we talk about distance.. don't forget Mod..

|t-r|=|t+s|
--> multiple solutions

when you combine (1) and (2)
t and s are +ve .
r=-s

thnaks .. +1 for clariying it clearly ....
VP
Joined: 18 May 2008
Posts: 1203
Re: DS - number line [#permalink]

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02 Oct 2008, 23:26
I liked the mathematical approach

--== 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] 02 Oct 2008, 23:26
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