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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:

数学

解答:

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阅读16554
解答: sysadmin

提问:

花了很久,还是错了,还影响了pace,求简便算法

解答:

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阅读1950
解答: sysadmin老师

提问:

官方指南教的工作问题是固定工作量,单个做和一起做的时间,现在5/4w和2w工作量不一样了,怎么套1/a+1/b=1/h这个公式呢?

解答:

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阅读1934
解答: sysadmin老师

提问:

看到题目就想把各自的速度表示出来,然后相加在去和总量5/4w相除,的确也算的很纠结,之前录音不是这样,但不是很听得懂,所以求解哈

解答:

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阅读1929
解答: sysadmin老师

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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阅读1928
解答: sysadmin老师

提问:

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? 4 6 8 10 12 之前那个男老师录音列的方程解起来就要好久。。。。麻烦老师再讲一下!

解答:

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阅读1934
解答: sysadmin老师

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