用去水泥和沙子各多少吨

  • 时间:2020-05-29 14:54:04
  • 分类:数学世界
  • 阅读:123 次

我的style同学提问:把水泥、沙子和石子按2:3:5配制出混凝土。在一次配料过程中,用去石子3吨,用去水泥和沙子各多少吨?

数学题解答:这是一道按比例分配的题目,通过题中的连比2:3:5可以看出,石子是5份;而石子用了3吨,说明每份是多少吨?(3÷5=0.6吨)

这里无论是石子、水泥还是沙子,它们每份的重量是相同的,都是刚刚求出的0.6吨。所以用0.6吨乘上它们各自的份数,便可以求出吨数了。

水泥:0.6×2=1.2(吨)

沙子:0.6×3=1.8(吨)

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