a small hotel wants tiles for its square place.how many dark tiles will be there if it needs 18 tiles

a tilling company specializes in multi-colour tile patterns. A small hotel is intersted in the pattern above for its square-shaped reception area. How many dark-coloured tiles will there be if the reception area needs 18 tiles on each tiles.There are 3 patterns o tiles.The first pattern is having 3*3 design and 4 dark tiles. The second pattern is havig 4*4 design and 8 dark tiles. The third pattern is having 5*5 design and 12 dark tiles.
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