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Demystifying the Alligation Method of Weighted Averages

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Senior Manager
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GMAT 1: 750 Q V
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Demystifying the Alligation Method of Weighted Averages [#permalink] New post 08 Oct 2012, 05:48
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No doubt that there have been times when GMATClubbers deftly invoke the famous "Alligation Method" in solving complex weighted averages and other ratio-related problems. When learnt properly and practiced consistently, the Alligation Method can save up to a whole minute, valuable time that is better spent on monster problems as Quant difficulty increases on your adaptive tests.

So, I am posting a journal article from 1958 that gives a basic primer on the Alligation Method. The author is so cool that he actually cites his mother-in-law as a scientific source, describing her as "....Mrs. L. F. Wilcox could beat most modern mathematicians at arithmetic, which she learned in the grade schools in upper New York State...."

Enjoy, you nerds. And please give +1 Kudos, if you appreciate this.

PS. The main thing to remember is to reverse the ratio of the "distances" in order to find the ratio of the actual "quantities" present.

PPS. This post is purely an academic exercise and by no means a final authority on the beautiful concept that is the Alligation Method.

Cheers,
Der alte Fritz.
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+1 Kudos me - I'm half Irish, half Prussian.

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Senior Manager
Senior Manager
User avatar
Joined: 15 Sep 2009
Posts: 271
GMAT 1: 750 Q V
Followers: 8

Kudos [?]: 52 [0], given: 6

Re: Demystifying the Alligation Method of Weighted Averages [#permalink] New post 20 Feb 2013, 06:31
OG12 Problem Solving #223 (page 184) contains a problem that illustrates how EFFICIENT and TIME-SAVING the alligation method can be if deployed properly.

Regards,
Der alte Fritz.
_________________

+1 Kudos me - I'm half Irish, half Prussian.

Re: Demystifying the Alligation Method of Weighted Averages   [#permalink] 20 Feb 2013, 06:31
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Demystifying the Alligation Method of Weighted Averages

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