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My patio is tiled with square tiles, all the same size. All the tiles are gray, except the tiles along the two diagonals, which are all yellow. (The corners are yellow, the center is yellow, and all the tiles along the diagonal in between are yellow.) If there are 81 yellow tiles, how many gray tiles are there?

 Aug 20, 2021
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This question is answered here: https://web2.0calc.com/questions/i-have-tiled-my-square-kitchen-floor-with-congruent-square-tiles-all-the-tiles-are-white-except-those-along-the-two-diagonals-which-are-a

 Aug 21, 2021

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