Three grades of milk are 1 percent, 2.7 percent and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2.7 percent grade, and z gallons of the 3 percent grade are mixed to give x+y+z gallons of a 2.5 percent grade, what is x in terms of y and z?	Choose the correct choice from the following answers:
A) y + 3z  B) (y +z) / 4  C) 2y + 5z  D) 3y + z  E) 3y + 4.5z
Based on the given information, the following equation could be dervied: 1% * x + 2.7% * y + 3% * z = 2.5% * (x+y+z) [equation*].   Then use algebra to figure out 1.5%*x = 0.2%*y + 0.5%*z. Thus, 15x = 2y + 5z.   2y + 5z
<result>C</result>
Three grades of milk are 1 percent, 2.7 percent and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2.7 percent grade, and z gallons of the 3 percent grade are mixed to give x+y+z gallons of a 2.5 percent grade, what is x in terms of y and z?