320 ft2
Simply multiply 16 times 20. Area is always Length times width (assuming you are talking about a rectangle).
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There are: 16*20 = 320 square feet
16 x 16.5 square feet
If the big square is 20 ft on each side the perimeter is 4*20 = 80 ft. The small square is one-fifth of the bigger square so each side will be 20/5 = 4 ft. The small square perimeter will be 4*4 = 16 ft. Combined perimeter = 80 +16 = 96 ft.
15*16 = 240 square feet.
16 ft * 24 ft = 384 ft2