苏教版五年级上册寒假作业p39第二大题

苏教版五年级上册寒假作业p39第二大题
How old are they?
Jack,Dick,Ann and Kate are brothers and sisters.I don't know how old each of them is.I only know,one is 18,and one is 15.One of the boys is 16,and one of the girls is 17.I also know,Jack is older than Ann,but Kate isn't.
1.How old is Kate?( )
2.How old is Jack?( )
3.How old is Dick?( )
4.How old is Ann?( )
很急……………………