选择题:在水槽里,装有浓度为13%的食盐水2000克,往这个水槽里倒人重600克和300克的A、B两种食盐水,水槽里食盐水的浓度变为10%。已知B种食盐水的浓度是...

题目内容:

在水槽里,装有浓度为13%的食盐水2000克,往这个水槽里倒人重600克和300克的A、B两种食盐水,水槽里食盐水的浓度变为10%。已知B种食盐水的浓度是A种食水的浓度的2倍。求A种食盐水的浓度是百分之几?

A.2.O% B.2.4% C.2.5% D. 3.0%

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