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Edad de Ana : 2x
Edad de Lucas : x
Hace 20 años la edad de Ana era el triple de la edad de Lucas
2x - 20 = 3(x - 20)
RESOLVIENDO:
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2x - 20 = 3(x - 20)
2x - 20 = 3x - 60
2x - 3x = -60 + 20
-x= -40
x = -40/-1
x = 40
REMPLAZAMOS:
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Edad de Ana : 2x = 2(40) = 80
Edad de Lucas : x = 40
RESPUESTA:
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La edad actual de Lucas es de 40 años