问题描述：
Mary saved exactly 60 percent of the total allowance she received in the last two weeks,and spent
the rest.If she received $20 for allowance each week and spent $12 of her first week's allowance,which of the following must be true?
the rest.If she received $20 for allowance each week and spent $12 of her first week's allowance,which of the following must be true?
问题解答：
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