Can some1 pls explain to me how to do this??! Katrina is building a deck. She cuts 3 lengths of wood from a 72-inch board. The first length is . 3. 30---. 4. inches. The second length is . 1. 12---. 4. inches. And the third length is . 1. 16--. 4. inches. How much of the original board remains after Katrina makes her cuts?