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You can take it out by removing the toilet, put it back in and reseal it with glass glue, and use a utility knife to cut the sealant before moving.
It's hard to say if it's 205, mainly because I don't know what the width is, if the width is 205, it's a square. Diagonal length is 205*. Yes, you can.
It's easy, just clean it, remove the toilet, close the drain and water pipes, fill in the floor and paint the ceiling, the walls.
The total area of the room is 630X510 = 321300 square centimeters, the area of a floor tile is 40X40 = 1600 square centimeters, the total area divided by the area of a floor tile is equal to the number required, 321300 1600 =, because the floor tile is a whole block, so take the whole number of 201 floor tiles.
It depends on the size of your living room, which can be accommodated in the living room under normal circumstances. My sister's house is a small three rooms (90 square meters), the living room put a meter of decorative paintings, there is still space at both ends, quite harmonious. Even if the wall is a little fuller, it can also be used as a sofa background wall, which is very good.
It's more accurate to ask your seller directly.