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b + n = 30 b - n = 20 entonces b + n + b - n = 30 + 20
2b = 50 b = 25 25 + n = 30 n = 5 luego
a/25 = m/5 entonces a = 5m
a - m = 5m - m = 4m = 10 m = 2,5 a = 12,5
Efectivamente
a/b = 12,5/25 = m/n = 2,5/5
a = 12,5 b = 25 m = 2,5 n = 5