作者JasonC0417 (没msn用真的很积歪)
看板GRE_Verbal
标题Re: [计量] b book 的数学问题
时间Tue Aug 21 10:25:26 2007
※ 引述《nashnash (新手上站)》之铭言:
: 先谢谢大家帮我解决
: 以下是题目
: By weight, liquid A makes up 7.0 percent of solution I and 14.5 percent
: of solution II. If 3 grams of solution I is mixed with 2 grams of solution
: II, then liquid accounts for what percent of the weight of the resulting
: solution?
: (A) 6.09%
: (B) 10%
: (C) 10.75%
: (D) 21.5%
: (E) 50% ans:B
: 谢谢
(7%*3+14.5%*2)/5
(0.21*0.29)/5 = 0.5/5 = 0.1 = 10%
溶质重 / 溶液重
就这样而已
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