Took GMATPrep CAT Practice Test 1 today. Scored a 710 which : DS Archive
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# Took GMATPrep CAT Practice Test 1 today. Scored a 710 which

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Manager
Joined: 15 Sep 2009
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Took GMATPrep CAT Practice Test 1 today. Scored a 710 which [#permalink]

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15 Sep 2009, 23:58
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Question Stats:

100% (05:44) correct 0% (00:00) wrong based on 1 sessions

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Took GMATPrep CAT Practice Test 1 today. Scored a 710 which I was surprised because of how many problems I missed. I missed 9 in Quant and 9 in Verbal. Projection was a 49 Quant and 38 Verbal. I have heard that people say that this test is most accurate. I have been scoring about a 680 on the Kaplan tests. I missed 5 in a row in quant and still got a 710!!! I just can't actually believe that they would let me get away with that. If anyone can verify that these projections are relatively semi-accurate, that would really calm my nerves.

Anyways, I found this problem and, although I have found the solution, I am sure that the steps I took to get there are not the most efficient. Here is the problem.

Data Sufficiency-

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 23, what is the value of R?
1. n is not divisible by 2
2. n is not divisible by 3

My Solution: I finally found that the numbers that are not div by 2&3 end up being prime or prime multiples of primes. Then, I finally realized though trial and error that all numbers surrounding the primes (i.e n+1 & n-1) are divisible by 2x2x2x3 (24). I have no clue why this phenomenon works and really don't care to. Is there some way to approach a problem of this nature more efficiently?

I also struggled with this one...

Q: If n and y are both positive integers and 450y=n^3, which of following MUST be an integer?

I. y/(3x2x2x5)
II. y/(3x3x2x5)
III. y/(3x2x5x5)

I missed this and still don't know how to solve. Apparently the answer is Only "I" but I don't know why.

Thanks.

-Anthony

PS: If this is posted in the wrong place... please let me know. It's my first post.
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16 Sep 2009, 00:59
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Welcome to GMAT Club!

GMAT Prep is pretty accurate and your score is up there - congrats. The number of questions you miss does not matter, rather the number of hard questions you answer correctly - different concept that takes a while to get used to.

Your post got moved to the right place - you will get the most help in the Math Forums.
No worries. We do have the largest database of questions and looks like yours have been addressed

remainder-r-82374.html

And here is the answer to the second one:
gmat-prep-n-71951.html
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Manager
Joined: 15 Sep 2009
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16 Sep 2009, 08:30
The second question was a great explanation and I understand that now. However, I still do not understand the first problem after viewing the link that you sent.
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16 Sep 2009, 20:44
I don't understand the first problem too
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17 Sep 2009, 00:49
aj1545 wrote:
The second question was a great explanation and I understand that now. However, I still do not understand the first problem after viewing the link that you sent.

it's because the link was not the good one.

Here is the link to that question

http://gmatclub.com/forum/gmatprep-division-by-24-again-83312.html
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