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48 12"x12" tiles for a 7'x7' patio.
16x16 square feet = 256 square feet, so two tiles will suffice.
20 squares x 20 squares = 400 squares
81 pavers (each 16 inches square) would be needed. 12 foot x 12 foot = 144 inches x 144 inches = 20,736 in2 16 inches x 16 inches = 256 in2 20,736/256 = 81