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[原始] prep 2 133题 求nn指教~

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楼主
发表于 2013-11-10 19:49:05 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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 n the group is 6 feet 2.5inches ,and the average height of the rest of the people n the group is f feet 10 inches
(2) the sum of the heights of the n people is 178 feet 9 inches.

选A ,所以说A项中的f是算作已知数吗
这种已知未知怎样判断呀  谢谢
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沙发
 楼主| 发表于 2013-11-11 10:09:06 | 只看该作者
不要沉呀。。。
板凳
发表于 2013-11-12 16:31:30 | 只看该作者
我还没开始做prep 看了这题后也觉得好纳闷~和你有相同的问题!! 然后copy了你的问题上网查一下,我发现的原题都是说: 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 1/2) inches and the average height of the rest of the people in the group is 5 feet 10 inches;
2) The sum of the height of the n people is 178 feet 9 inches.
lz 是你看错了么?应该不是f吧.....
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