Tiles and tiles

Geometry Level pending

If there is a floor of 20 by 10 ft. And is to be covered by some tiles of 2 by 2 ft. If tiles fitted along the boundary are BLUE in colour and the 1/3 of the number of tiles left is to be fitted after blue tiles are black in colour. Finally the remaining area of the floor is filled with white remaining tiles. Then FIND the number of white tiles?

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