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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