2. 外语
  3. A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms

A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms

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问题 A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard = 3 feet)
选项 A、20x
B、28x
C、60x
D、180x
E、540x
答案A
解析 一长为18英尺，宽为10英尺的长方形地板要全部铺上每平方码x美元的地毯。以x为单位，地毯总共需花多少钱?(1码=3英尺)
解：本题的正确答案为(A)。解答该题时，考生一定要注意前后单位的变化，一时疏忽很易选(D)。考虑单位变化，18/3 × 10/3 ×x=20x。
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