2007 AMC 12B 第 1 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
1.
Isabella 的房子有 间卧室。每间卧室长 英尺、宽 英尺、高 英尺。Isabella 需要粉刷所有卧室的墙壁。每间卧室中门和窗占 平方英尺，这些部分不粉刷。需要粉刷多少平方英尺的墙壁？
Isabella’s house has bedrooms. Each bedroom is feet long, feet wide, and feet high. Isabella must paint the walls of all the bedrooms. Doorways and windows, which will not be painted, occupy square feet in each bedroom. How many square feet of walls must be painted?
小提示：
一个房间的四面墙形成一个高为 的环带，围绕着地面。
The four walls of a room form a band of height wrapping around the floor
大提示：
每间房需粉刷面积为（地面周长）（高）。
The painted area per room is (floor perimeter)(height)
解答：
每间卧室地面周长为 英尺。
所以一间卧室的墙面粉刷面积为 平方英尺。三间卧室共需粉刷 平方英尺。
所以正确答案是 E。
The perimeter of each bedroom floor is feet.
So the wall area in one bedroom is square feet. Across all three bedrooms, Isabella paints square feet.
Thus, the correct answer is E.
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