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Gmat Prep - Mixture Problem

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by maxim730 » Fri Mar 16, 2007 2:07 pm
First time encountering a mixture problem. The formula on the cheat sheet won't work for this example.

Please see attached image. Thanks!!!!
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by jayhawk2001 » Fri Mar 16, 2007 9:31 pm
Given that the resulting mixture is 1.5% grade,

(1%x + 2%y + 3%z) / (x + y + z) = 1.5%
x + 2y + 3z = 1.5x + 1.5y + 1.5z
x = y + 3z
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by LalaB » Thu Jan 19, 2012 10:49 am
(x+2y+3z)/(x+y+z)=3/2

(x+y+z)/(x+y+z)+(y+2z)/(x+y+z)=3/2
(y+2z)/(x+y+z)=1/2

x=y+3z
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by GMATGuruNY » Thu Jan 19, 2012 12:41 pm
I posted an alternate approach here:

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by Anurag@Gurome » Thu Jan 19, 2012 8:46 pm
This means that x/100 + y * 2/100 + z * 3/100 =(x+y+z) * 1.5/100
Or 2x + 4y + 6z = 3x + 3y + 3z
Or x = y + 3z

The correct answer is A.
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