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 gir
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 is George is Sally is Ann is
英语人气:213 ℃时间:2020-01-27 03:51:09
优质解答
我来回答
类似推荐
- 1、Excuse me.Could you tell me the way______the bookstore?----Sorry,I do not know.I am____here.A、to;stranger B、of;new C、t
- find [f(x+h)-f(x)]/h,h≠0,for the functions defined as follows:
- 英语翻译
- For all numbers B and D,the operation #is defined by b#d=(b-2)(d+1).If (-2)#x=12,then what's the value of x
- 急!在线等答案!用英语回答的数学题.
猜你喜欢
- 110磅=多少斤=多少公斤
- 2母亲的鞋架 阅读答案
- 3198盏彩灯,4盏一组,红红黄蓝,198里有多少盏红灯和多少盏蓝灯?
- 4《黄鹤楼》中抒发诗人乡愁的诗句是?
- 5起重机吊着质量为5吨的物体,(1)若物体在空气中静止不动,则钢丝对物体的拉力为多少
- 6已知二次函数的图象经过点(0,-8)与(3,-5)且其对称轴是直线x=1,求此二次函数的解析式,并求出此二次函数图象与x轴公共点的坐标.
- 7大哥大姐,帮我写下
- 8N2H4的电子式
- 9_________.l'm ln class 1 ,grade 5.1.what row are you in 2.what ciass are you in
- 10Fill in the blanks with the words given