Octavia wants to make a quilt for her sister. She is going to build it from small, medium, and large t-shirts that her family is done with. A small t-shirt is 3 square feet of fabric. A medium one is 4 square feet. A large one is 6 square feet. If she uses 11 small shirts, 8 medium, and 6 large shirts, how many square feet is the quilt?
Give me a solution to this problem