单项选择题

A rectangular floor 18 feet by 10 feet is to become pletely 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)？（）

A. 20x
B. 28x
C. 60x
D. 180x
E. 540x

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单项选择题

A candy assortment consists of seven flavors of chocolate—covered creams packed in two—layered boxes with 27 creams in each layer．The flavors are always packed in rows so that the flavor varies with each piece in the following order：vanilla，orange，cherry，vanilla raspberry，lime，pecan， cherry，lemon． How many chocolate—covered vanilla creams are needed to pack 200 boxes of the assortment？（）

A. 600
B. 1，200
C. 1，800
D. 2，400
E. 3，600

单项选择题

A certain company has found that the number of labor hours required to produce x items is directly proportional to the square root of x．If 3 labor hours are required to produce 20 items，how many labor hours are required to produce 40items？（）

A.A
B.B
C.C
D.D
E.E

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