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# GMAT Prep.. I dont undertsand :(

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Intern
Joined: 20 Jun 2005
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GMAT Prep.. I dont undertsand :( [#permalink]  17 Jul 2006, 11:12
Hi,

Please look at the question in the attached image. According to me the answer should be 81 however gmac says the answer is 27.

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VP
Joined: 02 Jun 2006
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You need to pay attention to what the answer is saying.. its not asking you to find 9x3x3 which is 81 .

You need to find, the reverse i.e.

|9|x|6| = 3x9 x 6/2 = 27 x3 = 81

Now 81 = 3 x 27 = |27| (27 is odd => 3m)

Therefore Answer is : D. |27|

Just one of the type of questions where the GMAT makes us pick the one you calculate first.
Senior Manager
Joined: 29 Jun 2005
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Hi,
it is a simple gmatprep trick:

|9|*|6|=81

|81|=243 - not equal

|27|=27*3=81 - equal
Intern
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Thank you [#permalink]  17 Jul 2006, 12:40
Thanks a lot guys.

Boy, I need pratice....
SVP
Joined: 30 Mar 2006
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Simple. Remeber the answer choices are also in boxes

Hence [27] = 27*3 = 81
and [9] * [6] = 9*3 * 6/2 = 27*3 = 81
Senior Manager
Joined: 02 May 2004
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This is one where I still don't understand

Isn't the number in the box the final answer?
So for example 9 in the box makes m-3?
Senior Manager
Joined: 02 May 2004
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Man I feel stupid now
I was trying to make the problem harder than it was
I never had any trouble with operations problems before DUH:)
I surprised I do so well in verbal considering I make so many stupid mistakes in reading quant
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