Answer: He will need [tex]3\dfrac34[/tex] gallons of paint to paint the entire wall.
Step-by-step explanation:
Given : Area to paint = 142.5 square feet
Paint used to paint [tex]\dfrac15[/tex] of the wall = [tex]\dfrac34[/tex] gallon
Paint used to paint complete 1 wall = [tex]5\times\dfrac34[/tex] gallons
Paint used to paint complete 1 wall [tex]=\dfrac{15}{4}=3\dfrac{3}{4}[/tex] gallons
Hence, he will need [tex]3\dfrac34[/tex] gallons of paint to paint the entire wall.
