查人人中国名人网新款北斗星图片2017款:In 15 years she will be twice as old as her son.How old is she now?
来源：百度文库 编辑：查人人中国名人网 时间：2024/07/04 18:45:37
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If her son is 5, she is 25.
If her son is 6, she is 27.
If her son is 7, she is 29.
If her son is 8, she is 31.
If her son is 9, she is 33.
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你这道题有问题吧：设she的年龄现在为X，则她儿子的年龄为（X-15）
15后，她的年龄为儿子的2倍：
X+15=2[(X-15)+15)] ,X=15
则她儿子的年龄现在是0啊
In 15 years she will be twice as old as her son.How old is she now?
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