杭州交通信息网怀孕33周肚子发硬发紧: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：杭州交通信息网 时间：2024/10/05 10:51:01
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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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