扫描二维码，直接登录
题库 / OG2017Q-PS-12
There are five sales agents in a certain real estate office. One month Andy sold twice as many properties as Ellen, Bob sold 3 more than Ellen, Cary sold twice as many as Bob, and Dora sold as many as Bob and Ellen together. Who sold the most properties that month?
Andy
Bob
Cary
Dora
Ellen
题目分析：
这种题型直观有效的方法就是画一个表格，首先要设其中一个人卖了的房子为 1，或者 X也可以。因为题中说 Andy 是 Ellen 的 2 倍，我们可以假设 Ellen 是 X 或者 1 也可以，假设为 X，Andy 就是 2X ,Bob 是 X+3,Cary 是 2(x+3),Dora 是 X+3+X=2X+3.
下面画一个表格：X 肯定是大于等于 1 的整数；
| Name | Properties sold |
| Ellen | X |
| Andy | 2X |
| Bob | X+3 |
| Cary | 2X+6 |
| Dora | 2X+3 |