pp2-ps-55 (解答有誤)

Kath1985 · 发表于 2010-4-21 22:03:01

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

草稿纸 · 发表于 2010-4-21 22:14:59

D 吧

Kath1985 · 发表于 2010-4-21 22:23:16

謝謝

pp2-ps-55 (解答有誤)

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