SOLUTION: To make low-fat cottage cheese, milk containing 4% butterfat is mixed with milk containing 1% butterfat to obtain 15 gallons of mixture containing 2% butterfat. How many gallons o

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Question 217266: To make low-fat cottage cheese, milk containing 4% butterfat is mixed with milk containing 1% butterfat to obtain 15 gallons of mixture containing 2% butterfat. How many gallons of each milk must be used?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
.04x+.01(15-x)=15(.02)
.04x+.15-.01x=.3
.03x=.29
x=9.7
.04=9.7 gal
.01=5.3 gal