On the number line, if r<s, if p is halfway between r and s, : GMAT Problem Solving (PS)
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# On the number line, if r<s, if p is halfway between r and s,

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On the number line, if r<s, if p is halfway between r and s, [#permalink]

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17 Feb 2011, 07:54
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80% (02:08) correct 20% (01:42) wrong based on 145 sessions

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On the number line, if r<s, if p is halfway between r and s, and if t is halfway between p and r then (s-t)/(t-r)=

A. 1/4
B. 1/3
C. 4/3
D. 3
E. 4
[Reveal] Spoiler: OA

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Last edited by Baten80 on 17 Feb 2011, 08:59, edited 1 time in total.
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17 Feb 2011, 08:29
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Baten80 wrote:
On the number line, if r<S, if p is the halfway between r and s, and if t is the halfway between p and r, then s-t/t-r=

1/4
1/3
4/3
3
4

Also what do you mean by "What i will the s-t either s minus t or s to t"?

Original question is:

On the number line, if r<s, if p is halfway between r and s, and if t is halfway between p and r then (s-t)/(t-r)=
A. 1/4
B. 1/3
C. 4/3
D. 3
E. 4

Let r=0 and s=4 --> p is halfway between r and s: p=2;
t is halfway between p=2 and r=0: t=1;

(s-t)/(t-r)=(4-1)/(1-0)=3.

P.S. On the GMAT we can often see such statement: $$k$$ is halfway between $$m$$ and $$n$$ on the number line. Remember this statement can ALWAYS be expressed algebraically as: $$\frac{m+n}{2}=k$$.
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17 Feb 2011, 09:01
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Collections:-
PSof OG solved by GC members: http://gmatclub.com/forum/collection-ps-with-solution-from-gmatclub-110005.html
DS of OG solved by GC members: http://gmatclub.com/forum/collection-ds-with-solution-from-gmatclub-110004.html
100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html
Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html
Mixture problems in a file with best solutions: http://gmatclub.com/forum/mixture-problems-with-best-and-easy-solutions-all-together-124644.html

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17 Feb 2011, 09:05
Baten80 wrote:

Question is: $$\frac{s-t}{t-r}=?$$.
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Re: On the number line, if r<s, if p is halfway between r and s, [#permalink]

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02 Nov 2015, 00:48
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: On the number line, if r<s, if p is halfway between r and s,   [#permalink] 02 Nov 2015, 00:48
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