Question

Isabella 的房子有 $3$ 间卧室。每间卧室长 $12$ 英尺、宽 $10$ 英尺、高 $8$ 英尺。Isabella 需要粉刷所有卧室的墙壁。每间卧室中门和窗占 $60$ 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 $3$ bedrooms. Each bedroom is $12$ feet long, $10$ feet wide, and $8$ feet high. Isabella must paint the walls of all the bedrooms. Doorways and windows, which will not be painted, occupy $60$ square feet in each bedroom. How many square feet of walls must be painted?

$678$

$768$

$786$

$867$

$876$

答案：E

知识点：周长面积

难度评级：900

解答：

每间卧室地面周长为 $2(12+10)=44$ 英尺。

所以一间卧室的墙面粉刷面积为 $44\cdot8-60=352-60=292$ 平方英尺。三间卧室共需粉刷 $3\cdot292=876$ 平方英尺。

所以正确答案是 E。

The perimeter of each bedroom floor is $2(12+10)=44$ feet.

So the wall area in one bedroom is $44\cdot8-60=352-60=292$ square feet. Across all three bedrooms, Isabella paints $3\cdot292=876$ square feet.

Thus, the correct answer is E.

2007 AMC 12B 第 1 题

答案：E

难度评级：900

解答：

其他年份的第 1 题