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# GMAT Test M13 Master Thread - All discussions

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GMAT Club team member
Joined: 16 Mar 2009
Posts: 115
Location: Bologna, Italy

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13 May 2009, 01:08
Intern
Joined: 17 Mar 2008
Posts: 12

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14 May 2009, 13:57
i'm having a senior moment but can someone briefly explain number 17? thanks...
Founder
Joined: 04 Dec 2002
Posts: 15136
Location: United States (WA)
GMAT 1: 750 Q49 V42

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14 May 2009, 15:09
Alternative method that's not described in the solution is the backsolving. Take a look at the answer choices:

* 21
* 24
* 36
* 42
* 45

The problem states that the final ratio was 3:4 - that means that our answer choice has to be a multiple of 7. Only 2 answer choices fall into that category - A and D.
Backsolving for those yields:
A: 21 total employees or 9 female and 12 male. If we subtract 3 male, the ratio will be 50/50. Wrong.
D: 42 total employees or 18 female and 24 male. If we subtract 3 male, that's 18:21 or 6:7 - match

Hopefully this helps a little - this is probably the most elegant solution but you need to get comfortable with these.
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Intern
Joined: 17 Mar 2008
Posts: 12

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14 May 2009, 17:24
very good...got it.
Manager
Joined: 26 Dec 2009
Posts: 136
Location: United Kingdom
Concentration: Strategy, Technology
GMAT 1: 500 Q45 V16
WE: Consulting (Computer Software)

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02 Jan 2010, 17:29
I think this question# 36 is wrong in m13. Can anybody please elaborate.

If x is a positive integer, what is the hundreds digit of x^x ?

x is divisible by 10.
x is even.
Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Statement (1) by itself is sufficient. The hundreds digit of will be 0.

Statement (1) by itself is insufficient. The hundreds digit of cannot be determined.

if x=20 which is divisible by 10. then 20^20 = 400 and its hundreth digit is 4 not 0. I selected option E.
Intern
Joined: 29 Sep 2009
Posts: 23

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05 Jan 2010, 06:37
If x is divisble by 10 then it can be 10, 20, 30...

If we take 10^10 we get : 10 x 10 x 10 x 10 x 10 ...The hundreds is 0
If we take 20^20 we get : 20 x 20 x 20 x 20....The hundreds is 0
You see, in all the case the hundreds is 0

Stmt 2 is insufficient.

Manager
Joined: 08 Jul 2009
Posts: 172

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28 Apr 2010, 08:12
The explanation in the review mode is not clear at all. Thank you.
Specifically, if angle ADB is > angle CAD, isn't that sufficient? that is, isnt statement #2 sufficient on its own?
CIO
Joined: 02 Oct 2007
Posts: 1218

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29 Apr 2010, 06:54
Please note the difference between the images below the S2 explanation in the OE. It clearly demonstrates that using the info from S2 only we can't be sure that arc AB is longer than arc CD. In the first image arc CD is shorter than arc AB, in the second image CD is longer than AB. Note that S2 is true for both images. So, we have two ways these angles can be drawn and S2 is not sufficient by itself.

I hope it helps.
sher676 wrote:
The explanation in the review mode is not clear at all. Thank you.
Specifically, if angle ADB is > angle CAD, isn't that sufficient? that is, isnt statement #2 sufficient on its own?

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Manager
Affiliations: The Earth organization, India
Joined: 25 Dec 2010
Posts: 191
WE 1: SAP consultant-IT 2 years
WE 2: Entrepreneur-family business 2 years

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21 Jun 2011, 11:27
i would rate this test as a little hard compared to first 12. Got 14 incorrect, out of which 2 were silly mistakes and most were new concepts or tough problems.

learnt a lot from this set of 37 though.
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Re: GMAT Test M13 Master Thread - All discussions   [#permalink] 21 Jun 2011, 11:27
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# GMAT Test M13 Master Thread - All discussions

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