求助！prep里一个数学题

sweetcandy646 · 发表于 2011-3-20 16:56:29

working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate,a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain numberons of cartons, what percent of the cartons were sealed by machine working at the faster rate?
请问这题怎么做啊，23号就考试了，数学在prep里只有44分，郁闷啊。。。。都是粗心错的。
拜托顺便说一下具体的做题过程

unimelb86 · 发表于 2011-3-20 17:13:09

一起用时8/3 hours.

faster machine: (8/3) * (K/4)
slower machine: (8/3) * (K/8)

俩个一除，知道faster machine是slower machine的2倍。。那么就是总量的2/3.....

hope it helps

sweetcandy646 · 发表于 2011-3-20 18:29:41

谢谢谢谢哦，太感谢了，纠结了我很久。。。。

求助！prep里一个数学题

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