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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.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
分析A选项
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B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
分析B选项
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C

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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当前版本由贾思敏更新于2021-11-02 15:19:34 感谢由贾思敏对此题目的解答所做出的贡献。

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。

题目讨论（3条评论）

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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

0 回复 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?

0 回复 2019-11-04 14:40:25