La edad de Federico menos 5 equivale a la mitad de la edad de Camila y ambas suman 50 años
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F+C=50 o F=50-C
50-C-5=C/2
100-2C-10=C
90=C+2C
3C=90
C=90/3 = 30
F = 50-C = 50-30 = 20