SOLUTION: How many gallons of milk that is 3(1/2)% butterfat must be added to 80 gal of 1% butterfat milk to make milk that is 2% butterfat?

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Question 1100774: How many gallons of milk that is 3(1/2)% butterfat must be added to 80 gal of 1% butterfat milk to make milk that is 2% butterfat?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let the amount you need to add be X.
3.5X%2B80%281%29=%28X%2B80%29%282%29
Multiply both sides by 2,
7X%2B160=4X%2B320
3X=160
Solve for X, the number of gallons of 3 1/2% milk.