Randi needs to mow her lawn. The mixer requires 5 gallons of gas for every 2 gallons of oil. How much oil will she need for a gallon of gas? Your answer should be in the tenths.
To find out how much oil Randi needs for a gallon of gas, divide the ratio of gas to oil by 5. 2 gallons of oil / 5 gallons of gas = <<2/5=0.4>>0.4 gallons of oil will be needed for a gallon of gas. Answer: \boxed{0.4}.
