若这稿件由乙完成,需要几小时?

  • 时间:2020-05-16 11:04:24
  • 分类:数学世界
  • 阅读:128 次

数学题:一份稿件,甲、乙两人合打5小时完成,甲的工作效率相当于乙的80%,若这稿件由乙完成,需要几小时?

数学题解答:设稿件为1,这便是工作总量,只需求出乙的工效,便可以算出乙单独完成所需的时间。

甲、乙两人合打5小时完成,说明两人的工效和是1/5。

设乙工效为X,则有:

80%X + X = 1/5

X=1/9

乙的工效是1/9,所以乙单独完成所需的时间是:1 ÷ 1/9 = 9 (天)

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