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Helen is twenty years old, and her age is four times as much as Mary’s. When Helen’s age is twice as much as Mary’s, how old is Helen then?
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海伦20岁了，他的年龄是玛丽年龄的4陪，由此可知玛丽的年龄是5岁。设ⅹ年后海伦的年龄是玛丽年龄的2倍，则20+ⅹ=2（5+ⅹ），得ⅹ=10。十年后玛丽的年龄为30岁。
海伦20岁了，他的年龄是玛丽年龄的4陪，由此可知玛丽的年龄是5岁。设ⅹ年后海伦的年龄是玛丽年龄的2倍，则20+ⅹ=2（5+ⅹ），得ⅹ=10。十年后玛丽的年龄为30岁。
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