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Each Type A machine fills 400 cans per minute, each Type B machine fills 600 cans per minute, and each Type C machine installs 2,400 lids per minute. A lid is installed on each can that is filled and on no can that is not filled. For a particular minute, what is the total number of machines working?
(1) A total of 4,800 cans are filled that minute.
(2) For that minutes, there are 2 Type B machines working for every Type C machine working
就是这道题,答案选的C 但是我认为是D
从题干里可知一个A一个B一分钟可以做1000,从(1)里可知必有四个A和四个B,剩下的800必然是由两个整数组成,且一分钟内A必灌装400,B必灌装600, 所以那个800只能由两个A灌装,所以可以知道运行机器的个数,所以(1)单独可以
从(2)里可知有两个B就是1200罐,一个C是2400罐,所以剩下1200罐必由A完成,也就是三个A,所以也能知道运行机器的个数,所以(2)单独可以
求大佬帮助 |
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