Answer:
Unit rate at which Martin paints in walls per gallon is [tex]\frac{32}{25} wall/gallon[/tex].
Explanation:
Rate is defined as ratio between two quantities with different units.
Gallons of paint used by Martin = [tex]\frac{5}{8}[/tex] gallons
Portion of wall Martin wishes to pint = [tex]\frac{4}{5}[/tex] wall
Rate at which Martin paints the wall:
[tex]Rate=\frac{\text{Portion of wall covered}}{\text{Paint used}}[/tex]
[tex]Rate=\frac{\frac{4}{5} wall}{\frac{5}{8} gallon}=\frac{32}{25} wall/gallon[/tex]
Unit rate at which Martin paints in walls per gallon is [tex]\frac{32}{25} wall/gallon[/tex].
