Length of the tile = 30 cm = 0.3m
Area of the tile = 0.3 ×\times× 0,3 = 0.09 m2^22
Area of the room = (7.2 ×\times× 4.2)m2^22
Number of tiles = 7.2×4.20.09\frac{7.2 \times 4.2}{0.09}0.097.2×4.2
= 336
