小学英语综合应用Jack is twice as old as Bill,who is eight years youn

Jack is twice as old as Bill, who is eight years younger than Ben, who is four years younger than Ted,
Jack is twice as old as Bill, who is eight years younger than Ben, who is four years younger than Ted, who is half as old again as Jack.How old is Bill?
who is half as old again as Jack.How old is Bill? 捷克年龄是比尔的两倍,比尔比班小八岁,班比坦的小四岁,坦的比捷克大他（捷克）岁数的一半,问比尔几岁?
Ted is half as old as Jack坦的是捷克的一半大
Ted is as old again as Jack坦的毕捷克大一倍
Ted is half as old again as Jack坦的比捷克大他的一半
因此：捷克12 比尔6 班14 坦的18

杰克的年龄是比尔的2倍，谁比本年轻8岁，谁比泰德年轻4岁，谁的年龄比杰克大一半，求比尔是多少岁？
（望采纳，谢谢）