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Tenemos:
Precio de arepa rellena = a
Precio de menta = m
a = 2000 + m
50m + 10a = 23000
50m + 10(2000 + m) = 23000
50m + 20000 + 10m = 23000
60m + 20000 = 23000
60m = 23000 - 20000
60m = 3000
m = 50
a = 2000 + m
a = 2000 + 50
a = 2050
Precio de arepa rellena = 2050 pesos
Precio de menta = 50 pesos