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Zaurus 中文论坛 Forum Index » 经典难题

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少了一块钱
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badog
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Joined: 01 Nov 2006
Posts: 1021

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PostPosted: 2006-Nov-27 Mon, pm7:30 Reply with quote
 Post subject: 少了一块钱

有三个人去住旅馆,住三间房,每一间房$10元,于是他们一共付给老板$30,
第二天,老板觉得三间房只需要$25元就够了于是叫小弟退回$5给三位客人,
谁知小弟贪心,只退回每人$1,自己偷偷拿了$2,这样一来便等于那三位客人每人各花了九元,
于是三个人一共花了$27,再加上小弟独吞了不$2,总共是$29。可是当初他们三个人一共付出$30那么还有$1呢?
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wowotou



Joined: 27 Nov 2006
Posts: 38

小企鹅: 1101

PostPosted: 2006-Nov-28 Tue, am10:39 Reply with quote
 Post subject:

应该是这样吧 客人27=老板25+小弟2 30已经变成27了 和这些钱没关系了 至于29 完全是凭空算出的数 更没关系
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gbm12345



Joined: 28 Nov 2006
Posts: 20

小企鹅: 329

PostPosted: 2006-Nov-28 Tue, pm4:55 Reply with quote
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客人30=老板25+小弟2+小弟找回客人的3元, 至于29是把小弟的2元计算了两次, 完全是乱算出的数 是没关系的数
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米迈7500c



Joined: 01 Nov 2006
Posts: 46

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PostPosted: 2006-Dec-04 Mon, am10:20 Reply with quote
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这样想可不可以,老板退回5元实际上每人应该退到手1.66667元,只是小弟把0.666元舍去,也就是贪了,实际上每人出的钱是8.3333333*3=24.99999元+5元=29.9999元无限接近30元,没错。
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badog
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Joined: 01 Nov 2006
Posts: 1021

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PostPosted: 2006-Dec-04 Mon, pm8:30 Reply with quote
 Post subject:

米迈是什么专业,思维面宽,赞一个
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hrj



Joined: 25 Aug 2006
Posts: 27

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PostPosted: 2007-Jun-01 Fri, pm4:11 Reply with quote
 Post subject:

我是这么算的:
一、思维A
第1天房客出料30元;
第2天:30元钱都在,房东手里有25元;小弟手里有2元;房客每人1元计3元;加起来30元;没有差异;

二、思维B
房客总共支出27元;25元在老板;2元在小弟;

三、思维C
房客支出30元,房东收入25元;小弟收入2元;房客收入共3元;

此题是“支出”概念偷换;
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