It depends on the units used for 16x11. There will be a different answer depending on whether they are feet, inches, yards, metres, centimetres or some other measure of length.
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0.44444 square feet per tile.
A 6 ft * 12 ft tile will cover 72 square feet.
2.25 square feet
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.
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