How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 40 percent butterfat to obtain milk that is 20 percent butterfat? Select the correct option:  A) 6  B) 12  C) 14  D) 16  E) 28
Equate the fat:   0.1x + 0.4*8 = 0.2(x + 8) --&gt; x = 16.   Answer: 16.
<result>D</result>
How many gallons of milk that is 10 percent butter-fat must be added to 8 gallons of milk that is 40 percent butterfat to obtain milk that is 20 percent butterfat?