One 18 inch x 18 inch tile = 1.5 ft x 1.5 ft = 2.25 sq ft.
400 sq ft x 1 tile/2.25 sq ft = 177.77 = 178 tiles
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So each tile is 12" by 12" square, right? So each tile is ONE square foot? (a perfect square that's a foot long and a foot wide). Each tile is one square foot and you need to know how many add up to 400 square feet. I think the answer is the square root of Pi.
400 square feet
Assuming they are 20 by 20 inches, then the area of a tile is 400 feet2/144. 200 feet2/(400 feet2/144) = 72
Answer: 160,000 square feet = 3.67309 acres
400 square feet = 37.16 square meters.