5: the rectangle could have the following dimensions: 1*80, 2*40, 4*20, 5*16, 8*10. Notice that these are just all of pairs of numbers that multiply to 80.
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Area of a rectangle is length times width.
Length . . . any multiple of 15' Width . . . . any multiple of 15'
About 100 but that depends on the shape of the 80 sq ft surface being covered and whether you are willing to cut the tiles several times or not. 100*13*9=11700 sq in 80*144=11520 sq in so you don't even have two tiles over if the shape were perfect for the tiles.
To calculate the total number of tiles needed to make a rectangle that is 4 tiles wide, you would need to consider the length of the rectangle as well. If the length of the rectangle is x tiles, then the total number of tiles needed would be 4 times x, which simplifies to 4x. Therefore, the number of tiles needed to make a rectangle that is 4 tiles wide would be 4 times the length of the rectangle.
Rooms are generally rectangular in shape, so the floor space is the length times the width. Add up all the rooms (and corridors or other spaces) and you get the total for the house. If you have spaces that are not rectangular, then the calculations become a bit more complicated, but you can usually estimate a rectangular equivalent.