2.1 x 9 = 18.9 sq ft
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12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
Assuming you mean 11 feet by 17 feet, a sq yard is 3 x 3 = 9 sq feet 11 x 17/9 = 20.8 sq yards required, or about 21 sq yards
2178 sqare feet = 726 square yards * * * * * NO! 9 sq ft = 1 sq yard so 2178 sq feet = 2178/9 sq yards = 242 sq yards.
430 sq feet = 430/9 sq yards = 47.77... sq yards.
3 ft = 1 yard, 9 sq feet = 1 sq yard 3900 sq feet = 3900 / 9 sq yards = 433 1/3 sq yards