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City Y has installed 30 parking meters at 15-foot intervals along a straight street. What is the number of feet between the firs
City Y has installed 30 parking meters at 15-foot intervals along a straight street. What is the number of feet between the firs
admin
2009-05-19
22
问题
City Y has installed 30 parking meters at 15-foot intervals along a straight street. What is the number of feet between the first meter and the last meter?
选项
A、200
B、420
C、435
D、450
E、465
答案
C
解析
城市Y在某条直的街道上安装了30个停车计价器(每隔15英尺一个),问第一个计价器与最后一个计价器之间有多少英尺?
解:本题的正确答案为(C)。考生答对该题的关键在于明白只有(n+1)个元素才能隔开n个距离。第一个计价器与最后一个计价器之间有(30-1)=29个15英尺的距离,即:29×15=435
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