Question

英语数学问题，请大家帮忙，谢谢！

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 ? 请写出步骤！谢谢

Answer 1

你好，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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Answer 2

30%* cream +milk*3% = 45*12%
cream+milk=45

cream=15gallons
milk=30gallons