SOLUTION: How much 9% butterfat whipping cream and 2% butterfat milk should be mixed to obtain 35 gallons of milk with 4% butterfat?

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Question 719027: How much 9% butterfat whipping cream and 2% butterfat milk should be mixed to obtain 35 gallons of milk with 4% butterfat?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
x and y for 2% fat and 9% fat.

%282x%2B9y%29%2F35=4 and x%2By=35. Solve for x and y.