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Number Line

by dlencz » Sat Apr 21, 2012 5:53 pm
Imagine a number line in which R and T are to the left and right, respectively, of S. Is zero halfway between R and S?

1) Zero is to the left of S
2) The distance between T and R is the same as the distance between T and -S

OA is C
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Source: — Data Sufficiency |
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by dlencz » Sat Apr 21, 2012 6:00 pm
I actually got this right but in thinking about I don't see why B isn't correct. How could 2 be possible if zero wasn't in the middle? If T were the same distance then either R would equal -S, in which case 0 would have to be in the middle, or S would initially be negative and the opposite would have to equal the sum of T and -R, which would make S initially to left of R and not possible according to the parameters. For example, if R were -2 and T were 4, S would either have to equal 2 or -6, and it couldn't be -6 because that would put it to the left of the R on the number line.

Could someone provide an example?
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by GMATGuruNY » Sat Apr 21, 2012 6:40 pm
I posted an explanation to a very similar problem here:

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