Three grades of milk are 1 percent, 2 percent and 3 percent fat by volume. If x gallons of 1 percent grade, y gallons of 2 percent grade and z gallons of 3 percent grade are mixed to give x+y+z gallons of 1.5 percent grade, what is x in terms of y and z?
A. y + 3z
B. (y+z)/4
C. 2y + 3z
D. 3y + z
E. 3y + 4.5z
Translate to equation x +2y + 3z = 1.5(x+y+z)
=> 2 y + 3z -1.5 (y +z) = 1.5 x – x
=> 0.5 (y + 3z ) = 0.5 x
=> y+ 3z = x
Hence A.
A
a
A
Undoubtedly A
A could be the only answer
A