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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.

Re: GMAT Test M13 Master Thread - All discussions [#permalink]
02 Jan 2010, 16:29

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.

The correct answer is A.

if x=20 which is divisible by 10. then 20^20 = 400 and its hundreth digit is 4 not 0. I selected option E.

Re: GMAT Test M13 Master Thread - All discussions [#permalink]
05 Jan 2010, 05:37

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

Re: GMAT Test M13 Master Thread - All discussions [#permalink]
28 Apr 2010, 07:12

Can someone please help with Q25 on M13? 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?

Re: GMAT Test M13 Master Thread - All discussions [#permalink]
29 Apr 2010, 05:54

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:

Can someone please help with Q25 on M13? 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?

Re: GMAT Test M13 Master Thread - All discussions [#permalink]
21 Jun 2011, 10:27

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.

_________________

Cheers !!

Quant 47-Striving for 50 Verbal 34-Striving for 40

gmatclubot

Re: GMAT Test M13 Master Thread - All discussions
[#permalink]
21 Jun 2011, 10:27