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by andreasonlinegr » Sun Jun 29, 2008 8:48 am
plz help with this!
why the answer is not 81-> (3 x9) x (6x 1/2)= 27 x 3 =81
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Re: GMAT prep question

by Ian Stewart » Sun Jun 29, 2008 9:06 am
andreasonlinegr wrote:plz help with this!
why the answer is not 81-> (3 x9) x (6x 1/2)= 27 x 3 =81
That's all correct, but there's one trap in the question that is very easy to fall into- all of the answer choices are also in boxes. You need to apply the box function to each answer choice to see which one also gives you 81. (it's the box of 27)
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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by andreasonlinegr » Sun Jun 29, 2008 9:15 am
thank you Ian. I was wondering what I was doing wrong. I need to be more careful. thanks again for your help !! I need more practice..
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by TRANGZON » Sun Jun 29, 2008 1:03 pm
My answer is that:

9 (in box) = 9x3 = 27

6 (in box) = 6x1/2 = 3

---> 9 (in box) x 6 (in box) = 27x3 = 81

27 (in box) = 3x27 = 81

Therefore, D is an answer.
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