浓度问题

  • 时间:2020-05-17 12:29:01
  • 分类:数学世界
  • 阅读:162 次

这是一道关于浓度问题的数学题:浓度为百分之8的盐水40kg,要配置含盐百分之20的盐水100kg,需加入的盐水浓度为百分之几?刚学,不明白,请老师帮忙解答一下。

数学题解答

设问题中的浓度为x。(注:它是一个百分数

等量关系式:原来盐水中含的盐+加入的盐水中含的盐=配成的盐水中含的盐

方程:40×8% + (100-40)×x = 100×20%

解这个方程:x=28%

答:需加入的盐水浓度为28%。

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