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Datos
A+B=120
B=A-4
Solución
Remplazando B
A+B=120
A+A-4=120
2A=120+4
2A=124
A=124/2
A=62
B=A-4
B=62-4
B=58
Respuesta
Las edades son: 62 y 58
Saludos...