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标题: GWD数学求助 [打印本页]

作者: 891758149 时间: 2013-6-2 07:33 标题: GWD数学求助

请大家帮忙看看这道题应该选什么？

Q13:

Juan bought some paperback books that cost $8 each and some hardcover books that cost $25 each. If Juan bought more than 10 paperback books, how many hardcover books did he buy?

(1) The total cost of the hardcover books that Juan bought was at least $150.

(2) The total cost of all the books that Juan bought was less than $260.

作者: napoleon 时间: 2013-6-3 06:34

我认为这道题选C
首先1.2单独都不能判断应该很明显吧~
然后，paperback books>=88已知(more than 10)
1）hardcover books>=150
2）all books <260

因为all books<260 paperback books>80
因此150=<hardcover books<172

因此hardcover books=150 因此为6本

作者: 891758149 时间: 2013-6-4 06:01

万分感谢！

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