把含糖5%和含糖8%的两种糖水混合成含糖6%的糖水

  • 时间:2020-06-10 18:36:27
  • 分类:数学世界
  • 阅读:139 次

“山村”老师提出了一个“把含糖5%和含糖8%的两种糖水混合成含糖6%的糖水”的数学问题,原题如下:把含糖5%(百分之五)和含糖8%(百分之八)的两种糖混合制成含糖6%(百分之六)的糖水600克,应取5%(百分之五)的糖水多少克?取8%(百分之八)的糖水多少克?

“闲庭信步”老师数学题解答:此题列方程解答比较容易理解。首先,含糖5%和含糖8%的糖水合起来是600克,设其中一种糖水重量为x克,那另一种就是(600-x)克;其次,糖水混合前两种糖水中含糖的重量的和,与混合后600克糖水中含糖的重量是相等的。据此可以列出方程:

解:设含糖8%的糖水为x克,则含糖5%的糖水为(600-x)克。

8%x + 5%(600-x)=6%×600

8%x + 30 – 5%x  = 36

3%x + 30 = 36

3%x = 6

x = 200

则含糖5%的糖水为:600-200=400(克)。

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