Try Another Problem Draw a diagram. Write an equation using for the unknown number. Solve. 1. Reina has a string that is 13 inches long and a string that is 8 inches long. How many inches of string does she have? • What do I need to find? • What information do I need to use? 0 1 2 3 4 5 6789012345678 19 20 21 22 23 24 2 Reina has inches of string.