Write an equation and solve it to find the answer to the question below. Use the 5-D Process to help you write the equation, if needed. Remember to define your variable and to write your answer in a complete sentence. Susan is buying three different colors of tiles for her kitchen floor. She is buying more red tiles than beige tiles, and three times as many navy-blue tiles as beige tiles. If Susan buys tiles altogether, how many tiles of each color does she buy?