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Help out pls with the following problem

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Help out pls with the following problem

by Delayed_flight » Wed Apr 07, 2010 9:38 am
This is one of the sample explanation PS questions given by Kaplan Premier Program:

If w>x>y>z on the number line and y is halfway between x and z, and x is halfway between 2 and z, then y-x/y-w=

1/4

1/3

1/2

3/4

1

The author applies the Picking Numbers stategy, assuming z=2, y=4, x=6. And then she states: That would make w=10. Why 10? Why not 8 for example?
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by thephoenix » Wed Apr 07, 2010 9:53 am
soln attached there is a typo in q pls edit
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by Delayed_flight » Wed Apr 07, 2010 10:10 am
Why 2a?
And maybe you have some sort of guide with basic math rules commonly met in Gmat? Any help would be really appreciated.
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by krbharat » Thu Apr 08, 2010 10:41 am
IMO:C

please let me know the oa.
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