How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 35 percent butterfat to obtain milk that is 20 percent butterfat?	Choose the correct choice.
A) 6 B) 12 C) 14 D) 16 E) 28
Equate the fat:   0.1x + 0.35*8 = 0.2(x + 8) --&gt; x = 12.   Answer: 12.
<result>B</result>
How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 35 percent butterfat to obtain milk that is 20 percent butterfat?