how many dark coloured tiles wpuld be needed if there would be 18 tiles on each side?

a small hotel is interested in the pattern above for its square shaped reception area.How many dark-coloured tiles would be needed if there would be 18 tiles on each side?

                                        THE  PATTERN

There are 3 designs of tiles.The first design have total 9 tiles and 4 dark tiles.The second design have total 16 tiles and 8 dark tiles.The third design have total 25 tiles and 12 dark tiles.

                         PLEASE HELP ME FOR THIS
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