Green OG 11th DS: Vinegar and water solution

OG 11th 绿皮 DS：

Page 164

Item 24

A certain 4-liter solution of vinegar and water consists of x liter of vinegar and y liter of water. How many liters of vinegar does the solution contain?

(1) x/4=3/8

(2) y/4=5/8

答案是D，关于(2)的解释：This proportion can be solved for y to determine the liters of water in the solution. Then, substituting this value of y in the equation x+y=4, which can be formulated from the given information, will give the value of x; SUFFICIENT.

请教大牛们，

4升溶液由x升醋和y升水组成，但x升醋和y升水混合所得溶液的体积不等于x+y吧？也就得不出x+y=4啊

谢谢！

考数学不是考化学吧

那倒是，谢谢！

不过，Green OG 11th Page 148 Line 8 says: Using the data given in the statements plus your knowledge of mathematics and everyday facts(such as the number of days in July or the meaning of counterclockwise), ....

我又看见有其他的类似2个溶液混合的

好像都是按照数学计算