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Janet wants to carpet a 12-feet by 15- feet rectangular room. If carpet costs $11.50 per square yard, how much will it cost her to carpet the room?

A $230

Be careful with this one. Note that the measurement of the room is given in feet, but the cost of the carpet is given in square yards. The easiest way to deal with this is to express the measurement of the room in yards; 12 feet by 15 feet is the same as 4 yards by 5 yards, so the room measures 20 square yards. At $11.50 per square yard, the cost to carpet the room would be 20 × $11.50 = $230.