Respuesta :
Step-by-step explanation:
Let x and y be the present ages of the father and his son respectively.
x + y = 80
2y = 40
y = 20
x + 20 = 80
x = 60
Step-by-step explanation:
Let x and y be the present ages of the father and his son respectively.
x + y = 80
2y = 40
y = 20
x + 20 = 80
x = 60