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[Problem Solving]

试题详情

题目:

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

选项:

A、4
B、6
C、8
D、10
E、12

答案:

E

提问:

思路和过程都明白,但是解题花费很长时间,最后答案还是解错了,有什么简便方法能快速得出答案?

解答:

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解答: sysadmin

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