60 square feet = 60*12*12 = sq inches.
Therefore, minimum number of tiles required = 60*12*12/(18*18) = 26.66...
ie 27 tiles.
That is the classroom answer to the mathematical question. However, in real life, the area to be covered may not be of a shape in which whole tiles can be used. In that case, unless you can use all the offcuts you will require more tiles.
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You'll need 200 18-inch tiles.
266.666666666 so rounding up 267 tiles.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
2.25 square feet
5,184 2-square-inch tiles are needed.