If the size of a tile is 6 inches by 6 inches, how many tiles are required to cover a floor 10 ft. wide and 15 ft. long?

Question: If the size of a tile is 6 inches by 6 inches, how many tiles are required to cover a floor 10 ft. wide and 15 ft. long?

Solution:
Side of the tile = 6 inches = 6/12 = 0.5 ft
∴ Area of one tile = 0.5 × 0.5 = 0.25 sq. ft

Area of the floor = 10 × 15 = 150 sq. ft

Number of tiles = 150 ÷ 0.25 = 600

∴ 600 tiles are required to cover the floor.