None.
A yard is a measure of distance, 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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You cannot convert sq ft into yards, you must convert sq ft into sq yards. There are 9 sq feet in 1 sq yard so there are 283.33 sq yards in 2550 sq ft.
5X30=150sq. ft. 150 sq. ft. / 9 sq. ft./sq. yard = 16.7 sq. yards
86,400 Sq. Ft.
a square yard is 3' X 3', which is 9 sq ft. 20 X 80 ft is 1600 sq ft. Divide that figure by the number of sq ft in a sq yard and you will get your answer. I've never actually seen a square yard, but doubtless they do exist, somewhere!
3 sq yards = 9*3 = 27 sq ft.