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PowerPrep Ratio Question

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PowerPrep Ratio Question [#permalink] New post 29 Apr 2006, 16:15
Hello,
I am new with GMAT, and I am trying to learn as much as possible. Have been out of school for quite some times and trying to catch up on the math and verbal is sure not easy. But after reading many subjects from this forum, I sure have gotten motivation and strength that I can do this. I have done the PowerPrep test 1 and it sure was very hard. My score is so low that it is pretty sad and have not seen anyone getting a score like mine. Please don't ask what the score is. I was trying to do the review after the exam and found out that it does not give any explanations. I have one problem that I was not able to solve and I was hoping that someone will be able to help me on this. I will really appreciate it.

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

a. y+3z
b. (y+z)/4
c. 2y+3z
d. 3y+z
e. 3y+4.5z
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Senior Manager
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 [#permalink] New post 30 Apr 2006, 05:19
x+2y+3z = 1.5(x+y+z)

Solve for x:

0.5y+1.5z=0.5x

x=y+3z

So, A
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 [#permalink] New post 30 Apr 2006, 08:58
thanks macca for the explanation.

I knew the answer was A because of the PowerPrep software, but did not know why.

Thanks a lot guys.
  [#permalink] 30 Apr 2006, 08:58
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