比杰克大半倍
设杰克此时2X岁,
由Jack is twice as old as Bill可知Bill为x岁,
由于who is eight years younger than Ben,所以Ben为x+8 岁
由于who is four years younger than Ted,所以Ted为x+12岁
由最后一句,就有
x+12=1.5x*2
x=6
Bill is 6 years old.
猜猜看（英语）Jack is twice as old as Bill,who is eight years young
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