how many gallons of cream that is 30% butterfat must be mixed with milk that is 3% butterfat to make 45 gollons that are 12% buterfat
人气：359 ℃ 时间：2020-05-13 03:36:49
解答
很高兴能够在这里回答你的问题,
设奶油cream X 加仑,则
30%X+(45-X)3%=45*12%
0.3X+1.35-0.03X=5.4
X=15
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