Tolong jawab pertanyaan no19 dan 20 paling gampang

19. 6/9 + 8/15 = 30/45 + 24/45 = 54/45 = 1 9/45 = 1 1/5
20. 4/6 + 4/7 = 28/42 + 24/42 = 52/42 = 1 10/42 = 1 2/21