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12 Oct 2007, 06:45
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I am confused how to solve such number line questions. Can you tell a strategy and solve this one for me.
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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12 Oct 2007, 10:20
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Set up equations and if ur still not sure there, then try using real values.
1) s is to right of 0. S could be 5 and R could be -5 or R could be -2. Insuff.
2) This essentially says that t-r=t-(-s) ---> s=-r.
However, we don't know the signs of s and r. r could be negative or positive. Additionally we don't know the relation to zero. S and R could very well be 0, thus 0 would not halfway between the values.
say s=8 then r must be -8. This tells us that 0 is the midpoint, but again we don't know if r and s are 0.
Im sure there is a better way to negate this choice, but I haven't found it yet.
Together we know that S is positive so we know that r is negative to make s=-r true. We also know that r and s are not 0. Thus this is suff.
1) s is to right of 0. S could be 5 and R could be -5 or R could be -2. Insuff.
2) This essentially says that t-r=t-(-s) ---> s=-r.
However, we don't know the signs of s and r. r could be negative or positive. Additionally we don't know the relation to zero. S and R could very well be 0, thus 0 would not halfway between the values.
say s=8 then r must be -8. This tells us that 0 is the midpoint, but again we don't know if r and s are 0.
Im sure there is a better way to negate this choice, but I haven't found it yet.
Together we know that S is positive so we know that r is negative to make s=-r true. We also know that r and s are not 0. Thus this is suff.
12 Oct 2007, 10:39
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Thx GMATBelt, It never occured to me to set up that equation. I tried picking nos but under pressure soometimes you cant think of appropriate nos.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
