Maria is planning to buy paint for her room. She wants to paint four walls and the ceiling of her square room. Each wall has a height of 9 feet and the length of each wall is 10 feet. The ceiling is the same size as one wall. A gallon of paint covers 350 square feet. How many gallons of paint does Maria need to buy?

To find the total area that needs to be painted, calculate the area of the walls and the ceiling.