How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 45 percent butterfat to obtain milk that is 20 percent butterfat?	Choose one
A) 6  B) 12  C) 14  D) 16  E) 20
Equate the fat:   0.1x + 0.45*8 = 0.2(x + 8) --&gt; x = 20.   Answer: 20.
<result>E</result>
How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 45 percent butterfat to obtain milk that is 20 percent butterfat?