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:73 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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