72:N = 102:51, 45:54 = 35:N, 12:15 = N:30, 91:35 = 13:N, 1:N = N:9

72:N = 102:51

45:54 = 35:N

12:15 = N:30

91:35 = 13:N

1:N = N:9

Answer:

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