GRE数学练习题讲解：percent of the weight

2022-06-14 07:19:25

　　新

　　10.By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution?

　　A 10%

　　B 13%

　　C 15%

　　D 19%

　　E 26%

　　这个题小学也经常遇到，(3*8%+7+18%)/(7+3)=15%

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