You would need 137 (136.23) 16" x 16" tiles to cover 22.5 square meters.
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56 16x16" tiles are needed.
If they 16 is in inches, this would be 256 square inches per tile. That would cover 10,496 square inches. Divide by 144 and you get 72.89 square feet.
90 tiles.
150 16x16" tiles; you'll have a small part of one tile left over.
1121/2 16x16-inch tiles.