None.
A yard is a measure of length while a square foot is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other.
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how menu sq yards in 15 ft by 23 ft
9 sq ft = 1 sq yard so 5160 sq ft = 5160/9 = 573.33... recurring sq yards.
10 ft * 24 ft = 240 sq ft = 240/9 sq yards = 26.66... sq yards
50 ft * 3 ft = 150 sq. ft150 sq. ft = 16.66667 sq. yards
220 sq. ft = 24.4444 sq. yards.