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DS - Lines

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Senior Manager
Senior Manager
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Joined: 05 Oct 2008
Posts: 258
DS - Lines [#permalink]

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New post 03 Feb 2009, 22:37
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

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

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

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SVP
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Joined: 07 Nov 2007
Posts: 1741
Location: New York
Re: DS - Lines [#permalink]

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New post 03 Feb 2009, 22:43
Answer should be C
(1) no infor about r
not sufficient

(2) multiple solutions see below explanation
not sufficient

Graphical approach:
See below for graphical approach.
s and t are positive-- in this case s=-r

s and t are -ve ... inthis case s-r (zero is not mid point)


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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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.

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Re: DS - Lines   [#permalink] 03 Feb 2009, 22:43
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