15.5 square yards = 140 square feet.
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140 sq yards = 1,260 square feet
1 sq yard = 9 sq feet so 6400 sq yards = 6400*9 = 57600 sq feet.
Assuming the yards means square yards, there are 33 sq yd * 9 sq ft/sq yard = 297 sq feet.
9 sq feet = 1 sq yard so 15*20 = 300 sq ft = 33.33... sq yards
262.77 sq yards