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Question:

Carpet costs $3 per square yard. The room that will be carpeted is 12 feet x 18 feet. How much will the carpet cost?

A $72
explanation

12 feet x 18 feet is equivalent to 4 yards x 6 yards = 24 sq yards. 24 square yards x $3/sq yard = $72. Remember 3 feet = 1 yard, but 9 sq feet = 1 sq yard.