求助：prep一道输血题

wgy45 · 发表于 2010-11-7 23:21:27

What is the average(arithmetic mean)height of the n people in a certain group?
1. the average height of the n/3 tallest people in the group is 6 feet 2又1/2inches, and the average height of the rest of the people in the group is 5 feet 10 inches.
2. The sum of the heights of the n people is 178feet 9 inches.

这题为什么选A呢？条件二错在哪里？

谢谢~

danoulini · 发表于 2010-11-8 00:00:40

n是未知的。

wgy45 · 发表于 2010-11-8 14:20:55

哦，对哦，我脑子估计已经坏掉了。。。谢谢哈

求助：prep一道输血题

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块