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Director
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DS Geometery.JPG [#permalink]

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New post 21 Sep 2008, 18:38
00:00
A
B
C
D
E

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(N/A)

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

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Senior Manager
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Re: DS - number line [#permalink]

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New post 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.

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SVP
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Re: DS - number line [#permalink]

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New post 22 Sep 2008, 01:16
IMO B.

From II, t-r = t - (-s) or -r = s....hence sufficient.

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Director
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Re: DS - number line [#permalink]

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New post 26 Sep 2008, 21:42
OA is C ... still confused ...

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SVP
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Re: DS - number line [#permalink]

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New post 27 Sep 2008, 00:13
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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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Kudos [?]: 1034 [1], given: 5

SVP
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Re: DS - number line [#permalink]

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New post 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.

Kudos [?]: 278 [0], given: 0

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Director
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Joined: 20 Sep 2006
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Re: DS - number line [#permalink]

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New post 02 Oct 2008, 06:53
1
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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 ....

Kudos [?]: 132 [1], given: 7

VP
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Re: DS - number line [#permalink]

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

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Re: DS - number line   [#permalink] 02 Oct 2008, 23:26
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