一道gre数学题By weight,liquid A makes up 7.0 percent of solution 1 and_英语解答

一道gre数学题
By weight,liquid A makes up 7.0 percent of solution 1 and 14.5 percent of solution 2.If 3grams of solution 1 is mixed with 2 grams of soluiton 2,then liquid A account for what percent what percent of the weight of the resulting solution?

人气：328 ℃　时间：2019-10-08 13:38:26

解答

0.07*0.6+0.145*0.4=0.1.也就是10％.0.6和0.4其实就是混合溶液里1和2所占的百分比.
这道题用概率论的方法来思考快一些,因为GRE考试没时间让你算那么多的质量出来,越快速的方法越好.