本版推荐：

jasontomonaga
 
等　级：黄金词友

              积　分：2281分

        专家分：49分

看我其他帖子
看我的日志

        看我该帖回复

主题：[The Official SAT Question of the Day™] December 17th Wednesday

收藏本贴 | 好友分享 | 推广拿分

点击:332 | 回复:3 | 标签:

If x + 2x is 5 more than y + 2y, then x – y =
A. –5
B.

E. 5

14
来顶一下

3
快速回复

复制地址

SAT题目：http://apps.collegeboard.com/qotd/question.do

楼主 Date: 2008-12-17 20:54:25

jasontomonaga

看我其他帖子
看我的日志

		看我该帖回复

Hint : The first step in solving this problem is to translate the given statement into a mathematical equation. Then you can use algebra to find the value of x – y.

沙发 Date: 2008-12-17 20:55:13

jasontomonaga

看我其他帖子
看我的日志

		看我该帖回复

Correct Answer: D

Here's Why: The statement given in words translates into the equation x + 2x = y + 2y + 5. This simplifies to 3x = 3y + 5. Then 3x – 3y = 5, and so 3(x – y) = 5.
It follows that x – y = .
Difficulty: Hard
Question Type: Standard Multiple Choice
(Mathematics)

板凳 Date: 2008-12-17 20:55:42

lackycoco

看我其他帖子
看我的日志

		看我该帖回复

x+2x-(y+2y)=5
3x-3y=5
(3x-3y)/3=5/3
x-y=5/3

4 楼 Date: 2008-12-21 05:12:40

参与讨论