SOLUTION: gotmilk dairy farm has 80 gallons of milk that is 5% butterfat. how much skinmilk (0% butterfat)should be mixed with it to make milk that is 2% butterfat?

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Question 700345: gotmilk dairy farm has 80 gallons of milk that is 5% butterfat. how much skinmilk (0% butterfat)should be mixed with it to make milk that is 2% butterfat?


Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = gallons of skim milk needed
+.05%2A80+=+4+ gallons of butterfat in 5% milk
--------------
+4+%2F+%28+80+%2B+x%29+=+.02+
+4+=+.02%2A%28+80+%2B+x+%29+
+4+=+1.6+%2B+.02x+
+.02x+=+4+-+1.6+
+.02x+=+2.4+
+x+=+120+
120 gallons of skim milk must be added
check:
+4+%2F+%28+80+%2B+x%29+=+.02+
+4+%2F+%28+80+%2B+120%29+=+.02+
+4+%2F+200+=+.02+
+4+=+4+
OK