SOLUTION: How many gallons of cream that is 23% butterfat and must be mixed with 28.5 gallons of milk that is 3% butterfat to make milk that is 4% butterfat?

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Question 838563: How many gallons of cream that is 23% butterfat and must be mixed with 28.5 gallons of milk that is 3% butterfat to make milk that is 4% butterfat?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.23a+.03*28.5=.04(28.5+a)
a = 1.5