That depends on how deep you want to spread it.
To cover 600 square feet, you need (111/9) cubic yards for every 6 inches of depth.
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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.
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.
It takes 3000 dimes to make three hundred dollars.
One-hundred million (100,000,000).It takes one hundred million of them.
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