The amount of paint p need to paint the walls of a room varies directly as the area A of the wall.if 2 gallons of paint is needed to paint a

"100 / 40 = 2 remainder 20
40 : 2 gallons = 20 : n gallons
2(20)=40n
40=40n
1 gallon=n
2 gallons + 1 gallon = 3 gallons
therefore, 3 gallons of paint are needed to paint a wall with an area of 100 sq metres.
I HOPE THAT MY ANSWER WAS CORRECT! :)"