240
Get extra for breakage.
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Don't see any reason why the answer should not be 240 square feet!
We don't see the units on the 12x12 tile, but we have to assume it's inches. So each tile = 1 square foot. The room measures 20-ft x 12-ft = 240 square feet. So it takes 240 tiles to cover the ceiling, and another 240 to cover the floor. In order to calculate how many tiles it takes to cover the walls, we need to know the height of the ceiling above the floor.
Two tiles of size 12 ft x 12 ft will cover 288 square feet and so should be sufficient.
240 ÷ 16 = 15
240 ÷ 2 = 120