问题 单项选择题

Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solution Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new solution is liquid X ?()

A.A

B.B

C.C

D.D

E.E

答案

参考答案:C

解析:

稍加分析就可发现此题等同于问10公斤的Y溶液蒸发掉两公斤的水后的溶液中的液态物质X在整个溶液中所占的百分比,根据题意可得其所占的百分比为

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