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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。
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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