 
 <translate> Three grades of milk are 1 percent, 5 percent and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 5 percent grade, and z gallons of the 3 percent grade are mixed to give x+y+z gallons of a 7 percent grade, what is x in terms of y and z?
Options:
(A) -1y - 2z
(B) (y +z)  / 4
(C) 2y + 3z
(D) 3y + z
(E) 3y + 4.5z Hmmm, my stream of consciousness: <ibo> Ụdị mmiri ara ehi atọ nwere pasent 1 nke abụba, pasent 5 na pasent 3 nke abụba. Ọ bụrụ na x gallons nke 1 percent ọkwa, y gallons nke 5 percent ọkwa, na z gallons nke 3 percent ọkwa na-agwakọta na-enye x + y + z gallons nke a 7 percent ọkwa, ihe bụ x na okwu nke y na z? Nhọrọ: (A) -1y - 2z (B) (y + z) / 4 (C) 2y + 3z (D) 3y + z (E) 3y + 4.5z Hmmm, m stream nke nsụhọ: 