I recently took this test, and stumbled on this very easy : DS Archive
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# I recently took this test, and stumbled on this very easy

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Intern
Joined: 06 Oct 2007
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I recently took this test, and stumbled on this very easy [#permalink]

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05 Nov 2007, 10:47
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I recently took this test, and stumbled on this very easy question. After continuous arguing (with myself) I figured I should post before I drive myself nuts. lol!

Here it is:

If WX=Y what is the value of XY?

(1) W(X^2) = 16
(2) Y=4

I chose C, but GMAT says it is A

Example:
Statement (1) X could equal 1 or 2 then W would equal 16 or 4 accordingly therefore WX= 16 or 8... so Y would equal 16 or 8
thus making XY not Def.

Am I missing something here? The question does not give any limitations so literally X, be a negative Number.
Manager
Joined: 01 Nov 2007
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05 Nov 2007, 10:58
Yup, it is A

1 W(X^2) = 16 given

Therefore W = 16/X^2

Putting this in WX = Y we get (16/X^2)*X = Y
16/X = Y
So XY = 16

2. Y = 4 obviously insufficient
Intern
Joined: 06 Oct 2007
Posts: 15
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05 Nov 2007, 11:23
Ahhhh.... Fabulous.

I think my brain needs a breather... for some reason I got tangled on that... and as I guessed it was totally easy!!! lol.
Thanks!!

~ Ev
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