<PRE><B>Question 70296</B>
When Frank and Mark finished milking, they found that they had 900 pounds of milk that was 2 percent butterfat. How much butterfat did they have to add to raise the butterfat content to 10 percent?
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Amt. of 2% milk is 900 lbs; amt. of fat is 0.02(900)=18 lbs
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Amt of 100% butterfat mild is x: amt. of fat is x lbs
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Amt of 10% mixture is (900+x); amt of fat is 0.10(900+x)=90+0.1x lbs
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EQUATION:
fat + fat = fat
18 + x = 90 + 0.1x
0.9x = 72
x = 80 lbs (amount of 100% butterfat that must be added)
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Cheers,
Stan H.</PRE>