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GMATPrep Question

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Manager
Joined: 07 Jul 2009
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22 Aug 2009, 19:30
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Please see attachment. I am doubtful of GMATPrep OA.
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Manager
Joined: 30 May 2009
Posts: 216

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22 Aug 2009, 20:41
4
KUDOS

Since I cannot draw that Square symbol in my post, lets assume that square symbol to be &

We are told &m = 3m if m is odd.
&m = m/2 if m is even.

Using these &9 = 27, &6=3. Hence &9 X &3 = 27 X 3 = 81.

Now out the given options, don't forget that anwer choices are not simple numbers. They are all preceeded by &.

So out of given choices, take D....which is &27 = 27 X 3 = 81. This matches with our answrer.

I know what tricked you.....A would have been right, if choice was simple 81 rather than &81.
Manager
Joined: 11 Aug 2009
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22 Aug 2009, 21:02
Good expl! sdrandom1
Senior Manager
Joined: 18 Aug 2009
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Schools: UT at Austin, Indiana State University, UC at Berkeley
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22 Aug 2009, 23:48
I did not see any symbol besides see
Why u are geting 27, instead of 81?
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Never give up,,,

Manager
Joined: 07 Jul 2009
Posts: 221

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23 Aug 2009, 07:39
sdrandom1 wrote:

Since I cannot draw that Square symbol in my post, lets assume that square symbol to be &

We are told &m = 3m if m is odd.
&m = m/2 if m is even.

Using these &9 = 27, &6=3. Hence &9 X &3 = 27 X 3 = 81.

Now out the given options, don't forget that anwer choices are not simple numbers. They are all preceeded by &.

So out of given choices, take D....which is &27 = 27 X 3 = 81. This matches with our answrer.

I know what tricked you.....A would have been right, if choice was simple 81 rather than &81.

What a trap this question is? Great catch and nice explanation. +1 from me
Manager
Joined: 13 Jan 2009
Posts: 170

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24 Aug 2009, 05:08
mirzohidjon wrote:
I did not see any symbol besides see
Why u are geting 27, instead of 81?

Pay attention to answer choices. They are not simple numbers!
Manager
Joined: 10 Aug 2009
Posts: 130

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24 Aug 2009, 08:47
sdrandom1 wrote:

Since I cannot draw that Square symbol in my post, lets assume that square symbol to be &

We are told &m = 3m if m is odd.
&m = m/2 if m is even.

Using these &9 = 27, &6=3. Hence &9 X &3 = 27 X 3 = 81.

Now out the given options, don't forget that anwer choices are not simple numbers. They are all preceeded by &.

So out of given choices, take D....which is &27 = 27 X 3 = 81. This matches with our answrer.

I know what tricked you.....A would have been right, if choice was simple 81 rather than &81.

Good one. I did not notice that answer choices were in squares as well and ended with A.
kudo for you!
Intern
Joined: 10 Apr 2009
Posts: 9

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24 Aug 2009, 09:36
Since it is (3*9) * (0.5*6) = 81, just find the expression that equals 81 (D).

I guess the trick here (besides seeing "81" and picking A) is that some people will want to apply BOTH the "multiply by three" and "divide by two" operations to the numbers in the boxes in the answer choices, you you only apply one or the other, based on whether the number in the box is odd or even.
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24 Aug 2009, 09:55
I still could not get why u are choosing 27,
I can not find there any square.
I got the answer 81, but can not move from there though...
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Never give up,,,

Manager
Joined: 10 Aug 2009
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24 Aug 2009, 11:59
mirzohidjon wrote:
I still could not get why u are choosing 27,
I can not find there any square.
I got the answer 81, but can not move from there though...

The answer choices are written with squares around them. Choice A is 81 but there is a SQUARE around it. So choice A is not 81 but actaully 3*81.
only 27 with square around it will give you 81. 27 with a square around it = 3*27=81, which is right
Manager
Joined: 28 Jul 2009
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25 Aug 2009, 04:45
Additionally, 81 could be [162] (162 is even, so = 1/2m=81) but there is no such choise
Senior Manager
Joined: 08 Jan 2009
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25 Aug 2009, 05:09
simple and good question. Will keep a note of it.
Intern
Joined: 20 May 2009
Posts: 39

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03 Oct 2009, 03:28
tricky question but makes sense.
What level do people think this question is at? 500 +, 600 +, 700 + ??
Re: GMATPrep Question   [#permalink] 03 Oct 2009, 03:28
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