We need to find the area of a rectangle. The area of a rectangle is given by:
[tex]\begin{gathered} A=w\cdot l \\ where\colon \\ w=width \\ l=length \\ \end{gathered}[/tex]The rectangular tiles that measure 1.5 feet by 0.8 feet. So the area of each tile is:
[tex]At=1.2ft^2[/tex]Therefore, the number of tiles will be the total area of the floor divided by the area of each tile:
[tex]\begin{gathered} t=\frac{A}{At} \\ t=\frac{A}{1.2} \\ t=(22.5\times12.5)\div(1.5\times0.8) \end{gathered}[/tex]