GWD数学请教

melody远行 · 发表于 2012-5-14 09:36:51

A total of 100 customers purchased books at a certain bookstore last week.If these customers purchased a total of 200 books, how many of the customers purchased only 1 book each?
(1)None of the customers purchased more than 3 books.
(2)20 of the customers purchased only 2 books each.
给的答案是C，可是我觉得A是单独可以求出来的。因为只能买1本或两本，所以x+2y=200,同时一共有100个顾客，所以x+y=100,是哪错了吗？

pigman007 · 发表于 2012-5-14 09:39:31

More than three books, 应该是不能超过3，但可以等于3

jy901018 · 发表于 2012-5-14 09:39:55

None of the customers purchased more than 3 books.不超过3本，说明还可以买3本，所以还有Z的出现

GWD数学请教

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