This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A metre is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
1 sq m = 10.76 sq ft, so 400/10.76 = 37.17 sq m
400 (sq feet) = 37.161216 sq meters
It is not entirely clear what the question is asking but the areas can be configured as80000 sq ft = 400 * 200 sq ft leaving an area of 400 * 200 sq ft, then 40000 sq ft = 400 * 100 sq ft leaving an area of 400 * 100 sq ft, then 10000 sq ft = 100 * 100 sq ft leaving an area of 300 * 100 sq ft, then 5000 sq ft = 100 * 50 sq ft leaving an area of 250 * 100 sq ft.
400 sq ft = 37.161 sq meters (rounded)
400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
400.
1 sq. m = 10.7639 sq. ft.so: 400 sq. m. = (400 * 10.7639) 4305.56 sq. ft.
120,000 sq ft
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.
20 ft x 20 ft = 400 sq. ft.
Yards are one-dimensional, sq ft are two-dimensional, question is meaningless in its present form.
400 ft x 800 ft = 320,000 sq ft. 1 acre = 43,560 sq. ft, so divide 320,000 / 43560 = 7.346 acres.