在水槽里,装有13%的食盐水2千克,往这个水槽里分别倒入重600克和300克的A、B两种食盐水,水槽里的食盐水就变成了10%的食盐水了.B种食盐水浓度是A种食盐水浓度的2倍,则A种食盐水的浓度是______%.
人气:168 ℃ 时间:2020-03-28 10:15:30
解答
[(2000+600+300)×10%-2000×13%]÷600÷2,
=[2900×0.1-2000×0.13]÷600÷2,
=[290-260]÷600÷2,
=30÷600÷2,
=0.025,
=2.5%;
答:种食盐水的浓度是2.5%.
故答案为:2.5.
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