Answer: 8.3 feet
We know the area of 1 tile is:
[tex]1tile=1ft^{2}[/tex] (1)
We also know Jack used 103.75 tiles to cover the whole bathroom floor, which is a rectangle.
Remembering (1), we have that:
[tex]103.75tiles=103.75ft^{2}[/tex] (2)
Which is also the area of the rectangle from which we only have the value of one of its sides, the width [tex]w[/tex]:
[tex]w=12.5ft[/tex] (3)
In addition, the area [tex]A[/tex] of a rectangle is given by the following equation:
[tex]A=w.l[/tex] (4)
Where [tex]l[/tex] is the length.
Substituting the value of the width written in (3) and the area (2) in equation (4):
[tex]103.75ft^{2}=(12.5ft)l[/tex] (5)
We finally have the value of the length of the bathroom floor:
[tex]l=8.3ft[/tex]
