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Weighted averages strategy

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Intern
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Concentration: Nonprofit, General Management
GMAT Date: 09-17-2012
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Weighted averages strategy [#permalink] New post 01 Jul 2012, 18:34
Hi all,

I am studying from the Manhattan GMAT books and can't seem to get a grasp on the strategy used for weighted averages problems. An example:

A feed store sells two varieties of birdseed: Brand A, which is 40% millet and 60% sunflower, and Brand B, which is 65% miller and 35% sunflower. If a customer purchases a mix of the two types of birdseed that is 50% miller, what percent of the mix is Brand A?

The solution in the book involves making a table. I am wondering if someone knows of another, quicker strategy.

Thanks a lot.

- AS
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Re: Weighted averages strategy [#permalink] New post 01 Jul 2012, 21:33
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asharma86 wrote:
Hi all,

I am studying from the Manhattan GMAT books and can't seem to get a grasp on the strategy used for weighted averages problems. An example:

A feed store sells two varieties of birdseed: Brand A, which is 40% millet and 60% sunflower, and Brand B, which is 65% miller and 35% sunflower. If a customer purchases a mix of the two types of birdseed that is 50% miller, what percent of the mix is Brand A?

The solution in the book involves making a table. I am wondering if someone knows of another, quicker strategy.

Thanks a lot.

- AS


there are 2 ways to solve it. The first is the traditional algebra where we take .4(A) +.65(B)/(A)+(B)=.5

The other method is from the Mixture Problems Made easy sheet that Im attaching. Its even simpler that way.
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Intern
Intern
Joined: 16 May 2012
Posts: 32
Location: United States
Concentration: Nonprofit, General Management
GMAT Date: 09-17-2012
GPA: 3.77
WE: Editorial and Writing (Journalism and Publishing)
Followers: 0

Kudos [?]: 8 [0], given: 3

Re: Weighted averages strategy [#permalink] New post 02 Jul 2012, 05:18
Thanks. This is a lot easier.

- AS
Re: Weighted averages strategy   [#permalink] 02 Jul 2012, 05:18
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