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b) 4/6, 6/9, 8/12, 10/15, 12/18.
c) 12/10, 18/15, 24/20, 30/25, 36/30
d) 14/12, 21/18, 28/24, 35/30, 42/36
e) 18/20, 27/30, 36/40, 45/50, 54/60