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 Post subject: AlgebraPosted: Mon Apr 05, 2010 3:00 pm

Joined: Sun Apr 04, 2010 2:11 pm
Posts: 8
Hi ,

Please explain the question #25 of the algebra book .The explanation of the answer in the book is very difficult for me to understand.

Please state what percentile question is this.

This question is a difficult one.

Thanks,
Bandita

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 Post subject: Re: AlgebraPosted: Mon Apr 05, 2010 6:42 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
starting with the condition that the XZ distance is double the XW distance, we have four possibilities:

W * X * * * Z
X * W * Z
Z * * * X * W
Z * W * X

the first and fourth are ruled out since W must be > X

If we add the condition that Y is exactly in between W and Z we get:

X * W Y Z
Z * * Y X * W

in the first possibility above, W-Y = -1 and Z-X = 4
so (W-Y)/(Z-X) = -1/4 (choice B)

-- Veritas

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