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18 inch x 18 inch tile is really (1 and 1/2) feet by (1 and 1/2) feet

That is (3/2) x(3/2) square feet = 9/4 square feet.

To cover 900 square feet we need (900)/(9/4) = (900) x (4/9) = 100 x 4 = 400 tiles

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Q: How many 18x18 ceramic tiles does it take to cover 900 sq feet?
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