12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
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In a piece of carpet that is 12 ft by 15 ft, there are 20 (twenty) square yards. Divide the length and width each by three to get the dimensions of 4 yards by 5 yards. multiply the length by the width to get an answer of 20 square yards.
100 (9 square feet to a yard)
You need 166.66 square yards of carpet.
10 square yards. Note, the amount of carpet you have to pay for may actually be more than 10 square yards as you will have to buy the entire width of the roll * the length you need. Assuming it is 12' wide you would need 12 square yards and if its 15' wide you would need 15 yards. No carpet store sells carpet by what you need but only by what the width of the roll is. So if you need a 10 x 9 piece, the carpet only comes 12 foot wide so you would take home a piece of carpet 12 x 9.
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