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a number line question

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or.elen
 Post subject: a number line question
 Post Posted: Wed Dec 16, 2009 4:09 pm 
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Students


Posts: 1
on the number line shown, is zero halfway between r and s?

------r--------s-----t---- ( their is a drawing of a line an r, s, t are points on it)

1)s is right to the ziro
2)the distance between t and r is the same as the distance between t and (-s)

the OA is C

i thought it should be B beacause the only possability i figured was that r=-s and then that makes sense. didnt find any other possabilities.

anyone?
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shrads.jp
 Post subject: Re: a number line question
 Post Posted: Fri Dec 18, 2009 1:14 am 
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Students


Posts: 11
The question is little tricky..

Consider Data 2 independently

We have two possibilities:
1) Keep S on the right side of zero and satisfy the condition
2)Keep S on the left side and again satisfy the condition

In both ways the data is sufficient, but our quest is whether zero is halfway ...this is where u seem to have miss out...

If u dont consider the Data 1 then u may or may not get zero halfway...

Thats y the answer is C
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RonPurewal
 Post subject: Re: a number line question
 Post Posted: Sat Jan 09, 2010 5:08 am 
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ManhattanGMAT Staff


Posts: 7146
i answered this here:

distance-on-number-line-ds-t4304.html
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