 <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: <yor> Àwọn wàrà oríṣi mẹ́ta ni wọ́n ní, èyí tó ní ọ̀rá tó jẹ́ ìdá kan nínú ọgọ́rùn-ún, ìdá márùn-ún nínú ọgọ́rùn-ún àti ìdá mẹ́ta nínú ọgọ́rùn-ún. Bí a bá fi x gallon ti ìmúdàgba 1%, y gallon ti ìmúdàgba 5%, àti z gallon ti ìmúdàgba 3%, pa pọ̀ láti fún wa ní x+y+z gallon ti ìmúdàgba 7%, kí ni x ní ìbámu pẹ̀lú y àti z? Àwọn àyè: (A) -1y - 2z (B) (y + z) / 4 (C) 2y + 3z (D) 3y + z (E) 3y + 4.5z Hmmm, iṣan mimọ mi: 