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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.

Iam not able to arrive at their answer. please help by explaining what iam doing wrong.

[/img]
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VP
Joined: 02 Jun 2006
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[#permalink]  17 Jul 2006, 11:22
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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[#permalink]  17 Jul 2006, 11:28
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
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[#permalink]  19 Jul 2006, 02:34
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
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[#permalink]  19 Jul 2006, 20:30
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
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[#permalink]  19 Jul 2006, 20:38
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
[#permalink] 19 Jul 2006, 20:38
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# GMAT Prep.. I dont undertsand :(

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