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The daily rate for a hotel room that sleeps 4 people is $ 39 for one person and x dollars for each additional person. If 3 peopl
The daily rate for a hotel room that sleeps 4 people is $ 39 for one person and x dollars for each additional person. If 3 peopl
admin
2009-05-19
24
问题
The daily rate for a hotel room that sleeps 4 people is $ 39 for one person and x dollars for each additional person. If 3 people take the room for one day and each pays $ 21 for the room, what is the value of x?
选项
A、6
B、8
C、12
D、13
E、24
答案
C
解析
某旅馆的4人间的每天收费是住1个人39美元,并且每多1人加收x美元。若3个人住该屋1天,并且每人付21美元,问x的值是多少?
解:本题的正确答案是(C)。解答本题的关键是对“and x dollars for each additional person”的理解。若考生能把这句话理解到位,那么就很容易把这道题做对。住一个人收39美元,住两个人收39+x美元,住3个人收39+2x美元,由题意可得:39+2x=21×3 → x=12
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