It is: 12*30 = 360 square feet
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12' * 21 ft = 12*21 sq ft = 252 sq ft.
each tile is 1 sq ft and room is 6x5=30 sq ft so you need 30tiles
12 ft x 41 ft = 492 sq ft
It is approx. 460 sq ft.
Area = 24 ft * 12 ft = 24*12 sq ft = 288 sq ft