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Manager
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GMATPrep Question [#permalink] New post 22 Aug 2009, 18:30
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 4 sessions
Please see attachment. I am doubtful of GMATPrep OA.
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4 KUDOS received
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Re: GMATPrep Question [#permalink] New post 22 Aug 2009, 19:41
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Answer should be D.

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.
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Re: GMATPrep Question [#permalink] New post 22 Aug 2009, 20:02
Good expl! sdrandom1
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Re: GMATPrep Question [#permalink] New post 22 Aug 2009, 22:48
I did not see any symbol besides see
Why u are geting 27, instead of 81?
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Re: GMATPrep Question [#permalink] New post 23 Aug 2009, 06:39
sdrandom1 wrote:
Answer should be D.

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
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Re: GMATPrep Question [#permalink] New post 24 Aug 2009, 04:08
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!
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Re: GMATPrep Question [#permalink] New post 24 Aug 2009, 07:47
sdrandom1 wrote:
Answer should be D.

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!
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Re: GMATPrep Question [#permalink] New post 24 Aug 2009, 08:36
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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Re: GMATPrep Question [#permalink] New post 24 Aug 2009, 08:55
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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Re: GMATPrep Question [#permalink] New post 24 Aug 2009, 10:59
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
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Re: GMATPrep Question [#permalink] New post 25 Aug 2009, 03:45
Additionally, 81 could be [162] (162 is even, so = 1/2m=81) but there is no such choise
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Re: GMATPrep Question [#permalink] New post 25 Aug 2009, 04:09
simple and good question. Will keep a note of it.
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Re: GMATPrep Question [#permalink] New post 03 Oct 2009, 02:28
tricky question but makes sense.
What level do people think this question is at? 500 +, 600 +, 700 + ??
Re: GMATPrep Question   [#permalink] 03 Oct 2009, 02:28
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