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问答题
Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?

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解析:
设Sam四年前为x,则Jane是2x,x+8=3/4(2x+8),x=4,所以四年前Sam 4岁,Jane 8岁,现在Jane是12岁。
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