jack is twice as old as Bill,who is 8 years younger lhan Ben ,who is 4years younger than Ted,who is

题目

jack is twice as old as Bill,who is 8 years younger lhan Ben ,who is 4years younger than Ted,who is
half as old again as jack.How old is Bill?谁能算出来 请速回.

答案

Suppose Jack is x years' old,
then Ted is x/2; Ben is x/2-4; Bill is x/2-4-8;
so we can get:x=3(x/2-4-8)
x=72
Bill is 24