Just under one square foot.
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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.
Assuming its 30 feet then its 30 x30 = 900 sq feet
1 metre * 150 cm = 1.5 sq metres = 1.5*10.764 sq feet = 16.146 sq feet
30 feet = 914.4 cm
400 sq cm equals 0.43 square feet.