100个人做题

来源: adou1108 于 2010-06-20 20:08:43 [] [旧帖] [给我悄悄话] 阅读数 : (245 bytes)

A group of 100 people to answer five questions. 81 got right on first, 91 got right on second, 85 got right on third, 79 got right on fourth, 74 got right on fifth.
Question: At least how many people got at least three questions correct?

所有跟帖： 

• 回复：100个人做题 -commentate- ♂ 给 commentate 发送悄悄话 (2 bytes) () 06/21/2010 postreply 10:01:52

• This is not the correct. -adou1108- ♀ 给 adou1108 发送悄悄话 (32 bytes) () 06/21/2010 postreply 10:07:18

• 回复：This is not the correct. -commentate- ♂ 给 commentate 发送悄悄话 (2 bytes) () 06/21/2010 postreply 10:08:12

• At least 91 people got at least one question correct. -皆兄弟也- ♂ 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/21/2010 postreply 10:26:10

• At least 91+85-100=76 people got at least two questions correct. -皆兄弟也- ♂ 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/21/2010 postreply 10:28:15

• At least 76+81-100=57 people got at least three questions correc -皆兄弟也- ♂ 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/21/2010 postreply 10:31:47

• it is wrong! -皆兄弟也- ♂ 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/21/2010 postreply 22:13:10

• reason : -commentate- ♂ 给 commentate 发送悄悄话 (289 bytes) () 06/21/2010 postreply 13:14:17

• 回复：reason : -adou1108- ♀ 给 adou1108 发送悄悄话 (6 bytes) () 06/21/2010 postreply 17:55:18

• 回复：100个人做题 -jinjing- ♀ 给 jinjing 发送悄悄话 (59 bytes) () 06/21/2010 postreply 20:04:52

• The inequality isn't even necessary -ElizabethTaylor- ♂ 给 ElizabethTaylor 发送悄悄话 (775 bytes) () 06/22/2010 postreply 18:27:22

• 70 is notright,the best case : 5*70=350,411-350=61,there 30 peop -jinjing- ♀ 给 jinjing 发送悄悄话 (48 bytes) () 06/22/2010 postreply 20:19:24

• I'm careless,410 not 411,but the inequolity is good.we can very -jinjing- ♀ 给 jinjing 发送悄悄话 (0 bytes) () 06/22/2010 postreply 20:29:24

• fast to get answer.(if the anwser is less than smallest number) -jinjing- ♀ 给 jinjing 发送悄悄话 (0 bytes) () 06/22/2010 postreply 20:33:56

• 回复：I'm careless,410 not 411,but the inequolity is good.we can ve -commentate- ♂ 给 commentate 发送悄悄话 (32 bytes) () 06/23/2010 postreply 07:11:14

• 回复：回复：I'm careless,410 not 411,but the inequolity is good.we can -jinjing- ♀ 给 jinjing 发送悄悄话 (166 bytes) () 06/23/2010 postreply 09:00:17

• 回复：回复：回复：I'm careless,410 not 411,but the inequolity is good.we -commentate- ♂ 给 commentate 发送悄悄话 (94 bytes) () 06/24/2010 postreply 10:11:47

• 回复：回复：回复：回复：I'm careless,410 not 411,but the inequolity is good. -jinjing- ♀ 给 jinjing 发送悄悄话 (204 bytes) () 06/27/2010 postreply 14:37:06

• 回复：100个人做题 -a1lehp- ♂ 给 a1lehp 发送悄悄话 a1lehp 的博客首页 (0 bytes) () 06/29/2010 postreply 17:14:53

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