数学题:实际的工作效率是原计划的百分之125

  • 时间:2020-06-09 15:19:31
  • 分类:数学世界
  • 阅读:162 次

数学题:某工程队铺一段铁路,原计划每天铺3.2千米,15天完成任务。实际的工作效率是原计划的百分之125,实际用多少天完成任务?(用比例知识解)

数学题解答:这题中,这段铁路的长度是一定的,即每天铺路的米米与天数的乘积是一定的,所以天数与每天铺路米数成反比例。

设实际用x天完成任务。

3.2×125%×x=3.2×15

x=3.2×15÷3.2÷125%

x=12

答:实际需要12天完成。

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