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Alan and Sue have each been saving one dollar a day and will continue to do so for the next month. If Sue began saving several days before Alan, in how many days from today will Alan have saved one-half as much as Sue?
(1)As of today, Alan has saved 7 dollars and Sue has saved 27 dollars.
(2)Three days from today,Alan will have saved one-third as much as Sue.
分析A选项
分析B选项
分析C选项
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错题4（第7题）反思：
Alan and Sue have each been saving one dollar a day and will continue to do so for the next month. If Sue began saving several days before Alan, in how many days from today will Alan have saved one-half as much as Sue?
题干：问A和S每天都存1刀，S比A早一些时间就开始存了，问在多少天之后A存的钱等于1/2的S存的钱？(要注意 one-half是1/2的意思）
(1)As of today, Alan has saved 7 dollars and Sue has saved 27 dollars.
条件一：今天A已经存了7刀了，S已经存了27刀了。设在x天之后A存A存的钱等于1/2的S存的钱，也就是（要注意S今天已经存的27刀里面已经包含了S比A早一些时间多存的钱，所以不用另外设这里的未知数，多此一举了）：
7+x=1/2（x+27），这是个一元二次方程，能求出x的唯一确定值，充分。
(2)Three days from today,Alan will have saved one-third as much as Sue.
条件二：从今天起三天后，A存的钱是1/3的S存的钱，未知数太多了，没有具体数值，不充分。
192925zzst
设需要x天。 7+x=二分之一的（27+x），可以求解x.所以不需要第二个条件
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2021-08-22 17:07:48
bubblestyyan
题目是错的 应该是Alan and Sue have each been saving one dollar a day and will continue to do so for the next month. if Sue began saving several days before Alan, in how many days from today will Alan have saved one-half as much as Sue?
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2019-11-04 14:40:25
Elvin0725
上传的题目都是错的= =根本没法做
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2019-10-26 09:25:33
听雪楼下堆雪人回复Elvin0725
我就说为啥我读不懂题
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2019-11-01 14:11:40
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