GRE
®
托福
®
雅思
GRE
®
提分活动
公开课
首页
文字推理
数学推理
分析写作
登录
注册
返回
小站备考
GRE
GRE数学
GRE数学真题
The average (arithmetic mean) of a and b is 10, and the average (arithmetic mean...
Question 15
Enter your answer as an integer or a decimal in the answer box. Backspace to erase.
收藏
笔记
反馈
我的笔记
5000
保存
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
The average (arithmetic mean) of a and b is 10, and the average (arithmetic mean) of c and d is 7. If the average (arithmetic mean) of a, b, and c is 8, what is the value of d ?
_____
我的答案：
登录查看答案
