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b. 4/9 = 8/18 = 20/45 = 24/54
c. 5/8 = 15/24 = 30/48 = 45/72
d. 6/7 = 24/28 = 42/49 = 78/91
8/18 20/45 24/54
15/24 30/48 45/72
24/28 42/49 78/91