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400 (sq feet) = 37.161216 sq meters
400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
1 sq. m = 10.7639 sq. ft.so: 400 sq. m. = (400 * 10.7639) 4305.56 sq. ft.
480 sq ft = 44.59 sq metres (to 4 sf).
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.