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!

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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!
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!

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

32 munces of 4% butterfat have 32*4%=1.28 butterfat
to make it 2.5%, needs 1.28/2.5%=51.2 munces milk
so, the 0% milk should be added is 51.2-32=19.2 munces

let skim milk =X
(0.04 * 32)/(32+X)=0.025
X=19.2
19.2 munces of whole milk should be added to obtain a mixture that is 2.5% butterfat

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