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Hijo = m
Resolvemos :
3m + m = 60
4m = 60
m = 60/4
m = 15
3m = 3 (15) = 45
Solución :
El papá tiene = 45 años
El hijo tiene = 15 años
Hijo = x
3x +x = 60
4x = 60
x = 60/4
x = 15
Padre = 3x = 3(15) = 45
Hijo = x = 15