On glancing through your morning paper you notice that four pages are missing. One of the missing pages is page 8. The back page

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问题 On glancing through your morning paper you notice that four pages are missing. One of the missing pages is page 8. The back page of this newspaper is 28. What are the other three missing pages?

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答案pages 7.2l and 22

解析 (一份报纸中一整页分为4 pages,每相对的两个pages的页码相加和都相等。如本题中,此份报纸共有28面,也就是有7大页,最外面一页的4 pages分别是1、2、27和28,1+28=29,2+27=29。丢失页面之一是page 8,那它的反面是page 7,相对应的是page 21和page 22。)
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