1) 12/18 = 2/3, 18/20 = 9/10, 20/24 = 5/6, 24/30 = 4/52) 56/49 = 8/7, 40/32 = 5/4, 48/36 = 4/3, 28/21 = 4/3
1) 12/18 = 2/3, 18/20 = 9/10, 20/24 = 5/6, 24/30 = 4/5
2) 56/49 = 8/7, 40/32 = 5/4, 48/36 = 4/3, 28/21 = 4/3