Prep上一输血题求指点。

cz900509

three grades of milk are 1 percent , 2 percent , and 3 percent fat by volume . if x gallons of the 1 percent grade , y gallons of the 2 percent grade , and z gallons of the 3 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 ?A. y+3z
B.(y+z)/4
C.2y+3z
D.3y+z
E.3y+4.5z
真心不会做，题目意思都不太懂，求详细解释

windie

简单的混合问题x+2y+3z=1.5(x+y+z)
答案是A
看等式应该可以理解了吧
LZ确认一下答案

维京少年

x+2y+3z=1.5(x+y+z).  对不对啊。。。。。A

cz900509

对的 谢了！