In 15 years she will be twice as old as her son.How old is she now?good

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In 15 years she will be twice as old as her son.How old is she now?good

In 15 years she will be twice as old as her son.How old is she now?good
In 15 years she will be twice as old as her son.How old is she now?
good

In 15 years she will be twice as old as her son.How old is she now?good
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.
...

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

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