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标题: pp2-ps-55 (解答有誤) [打印本页]

作者: Kath1985 时间: 2010-4-21 22:03
标题: pp2-ps-55 (解答有誤)
55.6410-!-item-!-187;#058&004809

The 15 homes in a new development are each to be sold for one of three different prices so that the developer receives an average (arithmetic mean) of $200,000 per home.If 4 of the homes are to be sold for $170,000 each and 5 are to be sold for $200,000 each, what will be the selling price of each of the remaining 6 homes?

(A) $200,000

(B) $210,000

(C) $215,000

(D) $220,000

(E) $230,000

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【答案】C
答案是不是該為D ?
【思路】設剩下六個,每個home賣得x元

X=220000元
求得x為220000 答案怎麼會是215000呢

作者: 草稿纸 时间: 2010-4-21 22:14
D 吧

作者: Kath1985 时间: 2010-4-21 22:23
謝謝

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