Find all School-related info fast with the new School-Specific MBA Forum

It is currently 27 Aug 2016, 01:23
GMAT Club Tests

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Demystifying the Alligation Method of Weighted Averages

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

5 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 15 Sep 2009
Posts: 271
GMAT 1: 750 Q V
Followers: 10

Kudos [?]: 66 [5] , given: 6

Demystifying the Alligation Method of Weighted Averages [#permalink]

Show Tags

New post 08 Oct 2012, 06:48
5
This post received
KUDOS
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.
Attachments

File comment: An old school journey into the Alligation Method. Enjoy, folks.
Alligation arithmetic method.pdf [138.8 KiB]
Downloaded 514 times

To download please login or register as a user


_________________

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

Senior Manager
Senior Manager
User avatar
Joined: 15 Sep 2009
Posts: 271
GMAT 1: 750 Q V
Followers: 10

Kudos [?]: 66 [0], given: 6

Re: Demystifying the Alligation Method of Weighted Averages [#permalink]

Show Tags

New post 20 Feb 2013, 07:31
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, 07:31
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic Weight Average Mean ammuseeru 3 24 Oct 2014, 12:27
5 Experts publish their posts in the topic Weighted averages visuals carcass 2 26 Mar 2013, 12:02
2 Experts publish their posts in the topic Finding Ratio from Weighted Average rakesh.id 2 21 Aug 2012, 04:28
22 Experts publish their posts in the topic A certain car traveled twice as many miles from Town A to Town B as it pgmat 14 27 Jan 2011, 16:35
14 Experts publish their posts in the topic weighted average problems msand 23 25 Apr 2010, 09:52
Display posts from previous: Sort by

Demystifying the Alligation Method of Weighted Averages

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.