一条英文的数学题whole milk is 4% butterfat.how much skim milk with 0

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一条英文的数学题
whole milk is 4% butterfat.how much skim milk with 0% should be added to 32 munces of whole milk to obtain a mixture that is 2.5% butterfat
我有个在美国的同学不会做!要用英文答!

let the volume of skim milk needed be x ounces
(32*4%)/(x+32)=2.5%
x=19.2
answer is 19.2 ounces

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