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# Three grades of milk are 1 percent,

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Manager
Joined: 12 Oct 2008
Posts: 103

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08 Jan 2009, 09:11
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Three grades of milk are 1 percent, 2 percent, and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3 percent grade are mixed to give x + y + z gallons of 1.5 percent grade, what is x in terms of y and z?

(A) $$y + 3z$$

(B) $$\frac{y + z}{4}$$

(C) $$2y + 3z$$

(D) $$3y + z$$

(E) $$3y + 4.5z$$
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SVP
Joined: 29 Aug 2007
Posts: 2453

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08 Jan 2009, 09:41
linau1982 wrote:
pls explain

x+2y+3z = 1.5 (x+y+z)
x = y + 3z
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Manager
Joined: 04 Jan 2009
Posts: 235

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08 Jan 2009, 09:53
please explain\estimate the difficulty level (as perceived by GMAT) for this question.
<500 level
500-600 level
600-700 level
700+ level

I think it is <500 level.
Manager
Joined: 12 Oct 2008
Posts: 103

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08 Jan 2009, 09:55
it looks like 300 level now, duhh..
Re: GMATPrep   [#permalink] 08 Jan 2009, 09:55
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# Three grades of milk are 1 percent,

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