Bill,George,Sally and Ann are brothers and sisters ,One of them is 15,one is 12.One of the boys is 13,and one of the girls is 14,Bill is older than Sally but Ann isn't.How old are they?Bill is George is Sally is Ann is

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Bill,George,SallyandAnnarebrothersandsisters,Oneofthemis15,oneis12.Oneoftheboysis13,andoneofthegirls

Bill,George,Sally and Ann are brothers and sisters ,One of them is 15,one is 12.One of the boys is 13,and one of the girls is 14,Bill is older than Sally but Ann isn't.How old are they?Bill is George is Sally is Ann is
Bill,George,Sally and Ann are brothers and sisters ,One of them is 15,one is 12.One of the boys is 13,and one of the girls is 14,Bill is older than Sally but Ann isn't.How old are they?
Bill is George is Sally is Ann is

Bill,George,Sally and Ann are brothers and sisters ,One of them is 15,one is 12.One of the boys is 13,and one of the girls is 14,Bill is older than Sally but Ann isn't.How old are they?Bill is George is Sally is Ann is
Bill 15 George 13 Sally 14 Ann 12
已知他们本别是15、14、13、12岁.
Bill、George中必有一个是13岁,Sally、 Ann 中必有一个是14岁（One of the boys is 13,and one of the girls is 14）.
Bill比Sally大,Sally比Ann大（Bill is older than Sally but Ann isn't）
根据“Sally、 Ann 中必有一个是14岁”的条件,假设Ann是14岁,由于Sally比Ann大,那么Sally只能是15岁.由于Bill比Sally大,那么Bill的岁数大于15,不符合12、13、14、15岁的条件.所以无解.
又假设Sally是14岁,由于Bill比Sally大,所以Bill只能是15岁,那么George就是13岁.Ann12岁,也满足"Sally的岁数大于等于Ann的岁数"的条件.
当然,你也可以根据BOYS的年龄条件作假设求解.答案是一样的.

Bill,George,Sally and Ann are brothers and sisters ,One of them is 15,one is 12.One of the boys is 13,and one of the girls is 14,Bill is older than Sally but Ann isn't.How old are they?Bill is George is Sally is Ann is Bill,George,Sally and Ann are brothers and sisters.I know that one of them is eighteen,one of the..bill___,george___,sally____ ann____what table can we eat? 寒假作业英语脑筋急转弯1.Bill,George,Sally and Ann are brothers and sisters.I know that one of them is eighteen,one of them is fifteen,one of the boys is sixteen and one of the girls is seventeen.I also know that Bill is older than Sally bu Bill,George,Sally and Ann are brothers and sisters.I know that one of them is eighteen,one of them is fifteen,one of the boys is sixteen and one of the girls is seventeen.I also know that bill is older than Sally but Ann isn't.How old are they?2.哪 1.Bill,George,Sally and Ann are brothers and sisters.I know that one of them is eighteen,one of the里那四个单词从左面看和右面看是一样的? This is Bill.Is that George?指示代词是? George George. George sally 选词填空（win/ defeat/ beat)Bill Clinton ___ George Bush for the presidency in 1992 Sally wanted Mary and Bill to help her clean the house.有什么句型 George is什么kind person 填a或者是an bill is an english boy.是什么意思 Who is the president of America now?A.George W·BushB.Washington.C.Bill Gates.D.Bill Clinton.各个英语爱好者,帮帮慧慧 i had got an email form sally yesterday.为什么错? sally had to have an operation《改为反义疑问句 》 Sally _______ in an office in central London.