16x16 square feet = 256 square feet, so two tiles will suffice.
549!
24 of them.
5*6=30*12=360/4=90 tiles
The answer will depend on the measurement of the tiles. 18 by 18 does not specify whether the units are inches of centimetres. The only units mentioned in the question are square feet!
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
192 tiles
76.6 tiles
67 tiles.
190
Two tiles will suffice since they will cover 36 square feet.
Since a 12x12 tile is one square foot, then 38 12x12 tiles will cover 38 square feet.
500/1.78 = 281 tiles
157 18 by 18 tiles are needed to cover 352 square feet.
start with 38 tiles.
Each tile covers 4 square feet. You will need 24.75 tiles to cover the area.
You will need at least 67 tiles. This will cover 150.75 square feet.