Three grades of milk are 1 percent, 2 percent and 4 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 4 percent grade are mixed to give x+y+z gallons of a 1.5 percent grade, what is x in terms of y and z?	Choose one
A) y + 5z B) (y +z) / 4 C) 2y + 3z D) 3y + z E) 3y + 4.5z
Based on the given information, the following equation could be dervied: 1% * x + 2% * y + 4% * z = 1.5% * (x+y+z) Then use algebra to figure out 0.5%*x = 0.5%*y + 2.5%*z. Thus, x = y + 5z.   y + 5z
<result>A</result>
Three grades of milk are 1 percent, 2 percent and 4 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 4 percent grade are mixed to give x+y+z gallons of a 1.5 percent grade, what is x in terms of y and z?