Explanation:
what that simply means is that the area he needs the files for is 27 ft².
as the tiles are squares, each one has an individual area of s² = 3/4 × 3/4 = 9/16 ft²
how many tiles do we need ?
as b many as how often the area of one tile fits into the total area :
27 ÷ s² = 27 / 9/16 = 27/1 / 9/16 = 27/1 × 16/9 =
= 3/1 × 16/1 = 3×16 = 48
he has to buy 48 tiles.