An 18 inch by 18 inch tile is one and a half feet by one and a half feet, or 3/2 ft by 3/2 feet.
Its area is two and a quarter square feet. (3/2 x 3/2 = 9/4).
The number of tiles needed is 121 divided two and a quarter.
That's 121 divided by 9/4 = 121 x 4/9 = 54 (rounding up to a whole number of tiles.
But this is the minimum number of tiles needed. The real answer will depend on the shape of the area to be covered, which determines how many tiles will need to be cut and how much wastage there will be.
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Assuming it's a 4x4 wall, 64 tiles
5*6=30*12=360/4=90 tiles
You would need a total of 89 tiles (88.88 tiles exactly) with those measurements to cover that area.
Lets do length and width in terms of tiles. The length is 6m/0.2m/tile 30 tiles and the width is 5m/0.2m/tile 25 tiles. Then the area is l X w 30 tiles X 25 tiles 750 square tiles. Since each tile is square, 750 tiles.
that question depends on how big your tiles are and how big your floor is