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英语智力题

In a day at the library, 64 people borrowed books. Twice as many people borrowed a thriller only as borrowed a science fiction only. Three people borrowed a biography only and 11 people borrowed both science fiction and a thriller but not a biography. The same number borrowed a biography and a thriller but no science fiction as borrowed one of each of three types. Twenty-one people did not borrow a thriller. One more person borrowed a science fiction book and a biography book than borrowed a biography only.How many people borrowed a thriller only?

2026年09月24日 14:48

有3个网友回答

网友（1）：

你那里有答案的吗？我算的是只借惊悚的是28人。
把借书情况分为以下6种情况：
只借惊悚
只借科幻
只借传记
借惊悚和科幻
借科幻和传记
借惊悚和传记

没借惊悚的是21人：只借科幻+只借传记+借科幻和传记
只借传记的人是3人借科幻和传记的比只借传记的人多一人所以借科幻和传记的是4人
21=只借科幻+3+4 所以只借科幻的是21-7=14人
因为只借惊悚的人是只借科幻的两倍所以只借惊悚的是28人。

你那里有没有答案啊。。。如果我的错了请回复我正确答案及步骤，谢谢~！！

网友（2）：

two

网友（3）：