At the end of 2005 Walter was half as old as his grandfather

At the end of 2005 Walter was half as old as his grandfather . The sum of the years in which they were born is 3860 .How old will Walter be at the end of 2009 ?
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zhiqiu8805 幼苗

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在2005年时，walter是他爷爷的一半岁数大，他和他爷爷的出生年份加起来是3860，那么，在2009年时walter多大？
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