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Whenever different units are specified in a problem, we need to convert them to one common unit. The total area is given in square meters but the tile measurements are given in cm. So let's convert the tile measurements to meters. Why not convert the total area to square centimeters. Sure you can, only thing is all measurements must be in the same unit. No mixing of units. So the tile size in meters is 0.3m x 0.3m and so the area of a single tile is 0.09 square meter. Divide total area by area of a single tile and you will get the number of tiles needed. Thus the number of tiles needed is 18.5/0.09 = 205.5 tiles, make it 206 tiles.

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13y ago

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