A water cooler has 4.2 gallons of water in it. Simon spills 0.25 of a gallon of the water. He uses the expression below to find how many gallons of water are remaining in the water cooler. 4.2 - 0.25 How many gallons of water are remaining in the water cooler? O 1.7 gallons O 3.05 gallons O 3.95 gallons O 4.05 gallons