None.
A yard is a measure of distance, whereas a square foot is a measure of area. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
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2880 sq ft = 192 ft x 15 ft = 64 yds x 5 yds = 320 sq yds
If you are looking for square yards, just divide the 50 sq ft by 9 (# of sq ft in a sq yard) which equals 5.5555... sq yds.
3 sq yards = 3*9 sq ft = 27 sq ft
Assuming you mean how many square yards in 19 sq ft:1 sq yd = 1 yd x 1yd= 3 ft x 3 ft= 9 sq ft⇒ divide by 9 to convert square feet to square yards⇒ 19 sq ft = 19 ÷ 9 sq yds= 21/9 sq yds~= 2.11 sq yds
1 yd = 3 ft 1 sq yd = 1 yd x 1 yd = 3 ft x 3 ft = 9 sq ft ⇒ 70 sq yds = 70 x 9 sq ft = 630 sq ft