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
240
A 12x12 inch paver is one square foot. So you would need 240 square feet.
6x3 would require 2 pavers by 4 pavers to make a square foot which is 8 pavers per square foot. 240 pavers. That's only a 5 foot by 6 foot square.
In theory the answer is 240 tiles but this assumes that the area is "well behaved" and, if not, that you are prepared to use all the offcuts to fill bits in mosaic-style. A shape which in 17 inches wide, for example, will require a lot more pavers.
6 inches x 3 inches = 18 square inches 18 sq/in = .125 sq ft 30 sq ft / .125 sq ft = 240 pavers NOTE: You should allow extra pavers as a "fudge factor".
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.
12 x 12 blocks (assumed as 12 inch x 12 inch) That means the blocks are 1 square foot each Hence to cover 240 square feet area, you would need 240 blocks
60 multiply 12 x 20=240 then divide 240 by 4=60
The electric furnace operates on 240 volts so a two pole breaker is needed.
240 square tiles are needed
Two tiles of size 12 ft x 12 ft will cover 288 square feet and so should be sufficient.