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15 ft x 15 ft = 225 sq feet = 209031.84 sq cm.

Area of aech tile = 30 cm x 30 cm = 900 sq cm.

So minimum number of tiles required = 209031.84/900 = 232.3 ie 233 tiles.

However, this answer assumes that the shape is well behaved and that there is no wastage. In real life it is best to allow 5% extra for wastage.

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Q: How many 30 x 30 cms tile do you need for 15 x 15 feet room?
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