It is 666.6666667yds. so if you round it is 666 yards.
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400 sq ft = 37.161 sq meters (rounded)
9 sq ft = 1 sq yd so 45 sq ft = 45/9 = 5 sq yds
Remember there are 9 sq ft. in 1 sq. yard. Hence 10 ft x 12 ft = 120 sq. ft. Divide by '9' 120 / 9 = 13 3/9 sq yds. = 13 1/3 sq yds = 13.333... sq yds.
400 square ft.
You don't.