SOLUTION: how much skimmed milk must be added to 200 pounds of milk which contains 4.8% butterfat to produce milk that contains 3.2% butterfat?

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Question 98278: how much skimmed milk must be added to 200 pounds of milk which contains 4.8% butterfat to produce milk that contains 3.2% butterfat?
Found 2 solutions by Nate, checkley71:
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
(px + (0.048)200)/(x + 200) = 0.032
where as p is the percent of butterfat in skimmed milk
and x is the amount of skimmed milk

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
200*.048=.032(200+X)
9.6=6.4+.032X
.032X=9.6-6.4
.032X=3.2
X=3.2/.032
X=100 POUNDS OF SKIMMED MILK IS NEEDED TO MAKE THE REQUIRED MIX.