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Kaplan CAT's - discuss...

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Kaplan CAT's - discuss... [#permalink] New post 23 Sep 2010, 15:41
so there's been a lot of discussion about the MGMAT CAT's. I just started the Kaplan today and wow...it's intense. I felt that the math is quite difficult and not really simulating of a lot of the actual GMAT questions because it requires a lot of computation. Anyone else feel the same? thought? Thanks.
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Re: Kaplan CAT's - discuss... [#permalink] New post 23 Sep 2010, 19:21
Is the verbal part of Kaplan relevant to OG?
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Re: Kaplan CAT's - discuss... [#permalink] New post 23 Sep 2010, 19:55
kaplan is pretty tame compared to mgmat. i think some people thing kaplan is like 600ish ques?
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Re: Kaplan CAT's - discuss... [#permalink] New post 23 Sep 2010, 21:07
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vwjetty wrote:
so there's been a lot of discussion about the MGMAT CAT's. I just started the Kaplan today and wow...it's intense. I felt that the math is quite difficult and not really simulating of a lot of the actual GMAT questions because it requires a lot of computation. Anyone else feel the same? thought? Thanks.

Hi vwjetty,

What problems in particular did you think required a lot of calculation? Because in my experience, the GMAT loves to give problems that appear to require calculation, but in reality have a back door that makes them solvable. Post links to a few of these problems, and I'll be happy to take a look and see what I can do!
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 07:47
Well here's a few. Took me right at or over 2 min to do. And still didn't get some of them right.

A student took 7 tests. The student's average score on the first 5 tests was 73. The student's average score on the final 5 of these 7 tests was 79. How much greater than the student's average score on the first 2 of these tests was the student's average score on the final 2 of these tests?
6
7
10
15
18

Each supervisor in the company oversees 18 workers. After a reorganization, the number of workers overseen by each supervisor will be 26. The number of workers remained the same after the reorganization. How many supervisors will be needed to oversee the company ’ s workers after such a reorganization?

(1) The company currently has 13 supervisors.

(2) Four fewer supervisors will be needed after the reorganization.

John is j years old and Keith is k years old, and both are at least one year old. Is j > k ?

(1) jk = 2 j

(2) j + k = 2 j
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 07:48
And also, is there a way to reset the Kaplan CAT's?

Coming from the MGMAT CAT's which does have that option I naturally assumed that the Kaplan one does as well but evidently I can't seem to find them.
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 09:20
This might help:

Kaplan Diag test - 560 (Q34/V35)
Kaplan CAT 1 - 650 (Q37/V49)
Kaplan CAT 2 - 590 (Q37/V30)
Kaplan CAT 3 - 580 (Q37/V29)
Kaplan CAT 4 - 660 (Q44/V36)
Kaplan CAT 5 - 690 (Q48/v37)
GMATPrep CAT 1 - 670
Kaplan CAT 6 - 730 (Q43/v55)
GMATPrep CAT 2 - 700 (Q47/V38)
Kaplan Ultimate Practice test - ??? didnt report scores. Test sucked, waste of time...
GMATPrep CAT 1 retake - 730 (Q47/V42)

Actual GMAT (June 2009) - 700 (Q44/V41)

Fast forward 15 months, I am now studying to retake the GMAT on 10/30. I've forgotten almost everything. I'm about 50% through my studies and took my first MGMAT test about a week ago and scored me a 640. I think that test was abnormally difficult. I plan on taking another tonight and probably another on Sunday. I'll post my scores.
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 09:58
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vwjetty wrote:
Well here's a few. Took me right at or over 2 min to do. And still didn't get some of them right.

A student took 7 tests. The student's average score on the first 5 tests was 73. The student's average score on the final 5 of these 7 tests was 79. How much greater than the student's average score on the first 2 of these tests was the student's average score on the final 2 of these tests?
6
7
10
15
18

Each supervisor in the company oversees 18 workers. After a reorganization, the number of workers overseen by each supervisor will be 26. The number of workers remained the same after the reorganization. How many supervisors will be needed to oversee the company ’ s workers after such a reorganization?

(1) The company currently has 13 supervisors.

(2) Four fewer supervisors will be needed after the reorganization.

John is j years old and Keith is k years old, and both are at least one year old. Is j > k ?

(1) jk = 2 j

(2) j + k = 2 j



Answer 1. Let a b c d e f g are 7 numbers in ascending order

Given a+b+c+d+e= 5*73---------------2
and c+d+e+f+g= 5*79 ---------------1

required = \frac{(f+g)}{2} - \frac{(a+b)}{2}

Subtract 2 from 1 we get (f+g) - (a+b) = 5*(79-73) = 30

=>\frac{(f+g)}{2} - \frac{(a+b)}{2} = 15 hence D

Answer 3.

Statement 1: Simplify it, you will get k=2 and no information about j...hence not sufficient.
Statement 2: Simply it, you will get k =j, hence the answer to the question 'is j>k' is NO...hence sufficient.

Answer is B.

Answer 2.... Since the total number of workers remains the same.

18x = 26y where x and y are number of supervisors currently and in future.

Statement 1: x = 13 => y = 9...hence sufficient.
Statement 2: y = x+4

using y = x+4 and 18x=26y or 9x=13y we get x = 13 and y = 9..hence sufficient.

Answer is D.
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 10:02
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vwjetty wrote:
Well here's a few. Took me right at or over 2 min to do. And still didn't get some of them right.

A student took 7 tests. The student's average score on the first 5 tests was 73. The student's average score on the final 5 of these 7 tests was 79. How much greater than the student's average score on the first 2 of these tests was the student's average score on the final 2 of these tests?
6
7
10
15
18

The first 5 tests had an average score 6 lower than the last 5 tests. since avg = total of terms/# of terms, and there were five terms (the tests) in each case, we can deduce that the total score of the second set of tests was 30 points higher than that of the first.

However, note that the two sets of tests overlap in the middle! Both are counting the middle three. That means those 30 extra points must come entirely from the difference between the first two and the last two. Since we have 30 extra points split among two tests, we can then deduce that the last two tests must have averaged 15 points higher than the first two.


Quote:
Each supervisor in the company oversees 18 workers. After a reorganization, the number of workers overseen by each supervisor will be 26. The number of workers remained the same after the reorganization. How many supervisors will be needed to oversee the company ’ s workers after such a reorganization?

(1) The company currently has 13 supervisors.

(2) Four fewer supervisors will be needed after the reorganization.
The statement gives us three variables--the original number of supervisors (S), the number of workers (W), and the new total of supervisors post-reorg. (N). It also gives us two equations: since a supervisor oversees 18 workers, there are 18 times as many workers orginally, so 18S = W. Then, we lose some supervisors; afterwards, the equation is 26N = W.

Since we have three variables, the mathematical properties of systems of equations tell us that we can always solve three unique equations using some or all of those variables. Since the stem gives us two equations, it means a unique equation--any unique equation!--will be sufficient unless it introduces another variable
[Reveal] Spoiler: technical exceptions
or is non-linear--any variables to powers higher than 1, or any two variables multiplied by one another.


1) S = 13 is a unique equation. Sufficient.
2) S - 4 = N is a unique equation. Sufficient.
The correct answer is (D), Either choice is sufficient.
Quote:
John is j years old and Keith is k years old, and both are at least one year old. Is j > k ?

(1) jk = 2 j

(2) j + k = 2 j

1) divide both sides by j. K = 2. J = ?
J could be 1, or J could be 3; he could be older or younger. Insufficient.
2) Subtract J from both sides. K = J. If k is equal to j, is is NOT less than J; the answer to this question is defnitely no. Sufficient.
The correct answer is (B), 2 alone is sufficient.


So as you can see, just like th GMAT, Kaplan questions are often designed to lure people in with the temptation of unnecessary algebra. But don't worry! As you go through the Kaplan course, you'll get a great sense of what common tricks and patterns you can use to avoid these pitfalls.
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Last edited by KapTeacherEli on 24 Sep 2010, 13:21, edited 1 time in total.
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 11:52
This is how I feel....

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yall are too smart for me hahaha.

But I just took this one after doing some more exercises from the MGMAT reviews and it make me feel a little better. But not much.

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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 12:12
Keep your head up. I've found the Kaplan CATs to score a little tougher. As long as you have a positive trend I wouldn't be too worried. Bang out the rest of those Kaplan CATs, or maybe try MGMAT, then save the GMAC ones for last. If you're scoring 720+ on the GMAC tests you can probably expect at least a 700 on the real thing
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 12:17
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Re: Kaplan CAT's - discuss... [#permalink] New post 24 Sep 2010, 18:18
gurpreetsingh wrote:


thanks. I'm not trying to get a 700+ score (yes, evidently I'm the only one) just trying to get in the 600 area. So hopefully I'm on the right track. Got about 3 or 4 weeks or so until I take the GMAT.
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Re: Kaplan CAT's - discuss...   [#permalink] 24 Sep 2010, 18:18
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