GMAT prep question

Ian Stewart: GMAT Instructor; Posts: 2621; Joined: Mon Jun 02, 2008 3:17 am; Location: Montreal; Thanked: 1090 times; Followed by:355 members; GMAT Score:780

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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andreasonlinegr: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Mon Jun 02, 2008 3:49 pm

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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TRANGZON: Junior | Next Rank: 30 Posts; Posts: 22; Joined: Mon Apr 14, 2008 3:36 pm; Location: California; Thanked: 1 times

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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