19. How many quarter hours are in 5 hours? Ans ____________________________ For # 20, and #21, see Big Book Lesson 2.7 for help20. Draw a model that shows 2/5 ÷ 1/3. Find the answer as well. Ans___________________ 21. Draw a model that shows 3/4 ÷ 1/2. Find the answer as well. Ans ____________________ 22. Find Each sum or difference for the following mixed number problems. You may use fraction arithmetic or decimal arithmetic. Show your work.