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marta paga 12
ramon 1/3 del total
carlos paga 60
entonces:
12 + 1/3R + 60 = R
72 = R - 1/3R => 72 = 2/3R => R = 108
luego piden la fraccion que pago marta:
fraccion que pago marta = cantidad que pago / total
fraccion que pago = 12/108 = 1/9