Question

Dave is painting a wall in his living room a bright red color. so far, he has painted 1/5 of the wall and has used 1/2 gallon of paint. how many gallons of paint does he need to cover the entire wall

Answer 1

2 and 1/2 gallons of paint because if 2/5 is painted with 1 gallon, then 4/5 would be 2 gallons and the last 1/5 would be half a gallon.