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 solu

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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 solu
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?

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 solu
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.

液体物质A在重量上占了溶液一的7%和溶液二的14.5%。如果取溶液一3g与溶液二2g混合，那么液体物质A占了混合溶液的百分之多少？
楼主是不是多打了个what percent ？
3g*7%=0.21g
2g*14.5%=0.29g
0.29g+0.21g=0.5g
0.5g/5g=0.1=10%
答案是10%

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