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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)
E.540x

A.20x
B.28x
C.60x
D.180x

【参考答案】

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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