There is 6 rows with 18 charis in each row.In the center of the charis,4 rows of 6 charos are brown. the rest of the charis are blue.how many charis are blue

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84? I think that that is correct. 108 chairs - 24 brown chairs = 84 blue chairs
84 are blue. 108 total chairs, minus 24 brown chairs equals 84 blue chairs.