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工作学习 / 求学深造 / 问一个可爱的问题。。。。五个很自私的人一起吃饭。每份餐是5元。如果是自己吃，其中一个人愿意付3. 5元去买一份餐，另外两个愿意付4.5去买一份餐，最后两个愿意付5.5去买一份餐。但是饭店只给一张账单。五个人最后同意平分账单。
问：如果五个人都是自私为了自己的利益，他们总共要了几份餐？
回答只能是整数，请付上原因。
谢了！
-jeffrey815(Smartiecat);
2002-10-22
{293}
(#811626@0)
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379 ?
-neteasy(neteasy);
2002-10-22
(#811725@0)
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五个人一顿饭吃了379 份？
-jeffrey815(Smartiecat);
2002-10-22
(#811736@0)
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既然自私,就是倒了也不让别人占便宜啊...
-neteasy(neteasy);
2002-10-22
(#811743@0)
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两个愿意付4.5去买一份餐?是俩人共吃一份，还是俩人各吃一份？
-lilyba(Sunshine);
2002-10-22
(#811746@0)
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4.5 for each meal for each separate person.
-jeffrey815(Smartiecat);
2002-10-22
(#811861@0)
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3份?
-bluegirl(bluegirl);
2002-10-22
(#811759@0)
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买3份,大家既省了钱,又多吃了饭
-bluegirl(bluegirl);
2002-10-22
(#811778@0)
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Right answer is 5. But thanks for your answer.
-jeffrey815(Smartiecat);
2002-10-22
(#811858@0)
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oh, i thought every 2 persons shared 1 meal except the first person
-bluegirl(bluegirl);
2002-10-22
(#811886@0)
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问题是若各自买的话,有价值各为3.5,4.5,5.5元的餐卖吗?
-bluegirl(bluegirl);
2002-10-22
(#811912@0)
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Answer: Since each colleague only pays 1/5 of his or her dessert, each has an incentive to order dessert, since 1/5 the cost of a dessert is less than each diner’s perceived value. Thus, five desserts will be ordered.
-jeffrey815(Smartiecat);
2002-10-22
(#811919@0)