SOLUTION: Cream is about 22% butterfat and low-fat milk is about 2% butterfat. How many gallons of cream must be mixed with 18 gallons of low fat milk to make whole milk that contains 4% but

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Cream is about 22% butterfat and low-fat milk is about 2% butterfat. How many gallons of cream must be mixed with 18 gallons of low fat milk to make whole milk that contains 4% but      Log On


   

Question 345393: Cream is about 22% butterfat and low-fat milk is about 2% butterfat. How many gallons of cream must be mixed with 18 gallons of low fat milk to make whole milk that contains 4% butterfat?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Cream is about 22% butterfat and low-fat milk is about 2% butterfat.
How many gallons of cream must be mixed with 18 gallons of low fat milk to make whole milk that contains 4% butterfat?
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Equation:
fat + fat = fat
0.22x + 0.02*18 = 0.04(x+18)
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Multiply thru by 100.
22x + 2*18 = 4x + 4*18
18x = 2*18
x = 2 gallons (amt. of cream needed in the mixture)
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Cheers,
Stan H.