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Weighted Average

Expert replies
Source: — Data Sufficiency |

by adam15 » Sun Nov 29, 2009 10:33 am
the answer is C.
Would you please tell me where you bought this GMAT practice.
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by mehravikas » Sun Nov 29, 2009 3:58 pm
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by mehravikas » Sun Nov 29, 2009 4:00 pm
Whats the source?
Abdulla wrote:OA is C
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by Stuart@KaplanGMAT » Mon Nov 30, 2009 12:15 am
Here's another thread in which I discuss using a number line to understand weighted averages:

https://www.beatthegmat.com/what-fractio ... 11500.html
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by adamsmith2009 » Wed Dec 02, 2009 1:56 pm
Just want to confirm that the answer is 66% based on the weighted average method. 1 and 2 are not sufficient so if we combine:

G-----------------Avg----------------U
40 20

U/G = 40/20 = 4/2 = 4/6 or 66%
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by Stuart@KaplanGMAT » Wed Dec 02, 2009 5:06 pm
adamsmith2009 wrote:Just want to confirm that the answer is 66% based on the weighted average method. 1 and 2 are not sufficient so if we combine:

G-----------------Avg----------------U
40 20

U/G = 40/20 = 4/2 = 4/6 or 66%
No, that's backwards.

The overall average is closer to the undergraduates, so the undergrads must carry more weight.

Well, it may be right if you're answering the wrong question :P

You've set up the number line and equations properly, but the question is what percent are graduate students, so the answer is 1/3, not 2/3.
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by adamsmith2009 » Thu Dec 03, 2009 5:16 am
Ahh - I see. I had the undergraduate ratio and not the graduate. Thanks Stuart.
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