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OG-91

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楼主
发表于 2009-1-5 20:43:00 | 只看该作者

OG-91

if sam were twice as old as he is, he would be 40 years older than Jim. if jim is 10 years younger than Sam, how old is sam?

Q: sam were twice as old as he is-->  S=2H or H=2S? why?


[此贴子已经被作者于2009-1-5 20:43:18编辑过]
沙发
发表于 2009-1-5 21:10:00 | 只看该作者
sam=30
jim=20
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