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?
人气：274 ℃ 时间：2020-02-15 08:56:51
解答
玛丽节省下了之前两周收到的津贴总额的60％,花掉了其余的部分.如果她每周得到的津贴为20美元,而她花去了上周津贴中的12美元,那么以下哪项必定为真?
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