数学题:两队合修4天后,还剩下5000米

  • 时间:2020-05-12 13:42:36
  • 分类:数学世界
  • 阅读:167 次

数学题:一条公路,甲队修完要10天,乙队修完要8天。两队合修4天后,还剩下5000米,这条路共长多少米?

数学题解答:把这条公路看作“1”。

甲队每天修:1/10

乙队每天修:1/8

两队4天共修:(1/10 + 1/8) × 4 =9/10

还剩:1 – 9/10 = 1/10

剩下的5000米就是这条公路的1/10,所以这条公路长:

5000 ÷ 1/10 = 50000(米)

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