One square yard equals nine square feet, therefore 400 sq.ft. is 44.4444 square yards.
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1 sq yard = 9sq feet so 3600/9=400 sq yards
to figure yards of soil you need cubic feet ( 400 sq ft X how deep??)then divide by 9
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