The gas tank of Priya's pontoon boat can hold 5 gallons and it is completely empty. Priya needs a full tank for the day's activities. She adds 2 1/4 gallons from a gas canister and then takes the boat to a nearby marina to fill it up. She has to pay ahead. Priya wants the tank as full as possible but does not want to overpay. How many gallons should Priya ask for?
