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Edad de Lupe = x
Edad de Pilar = 2x/3
2x/3 + x = 30
2x/3 + 3x/3 = 30
(2x + 3x)/3 = 30
5x/3 = 30
5x = 30 * 3
5x = 90
x = 90/5
x = 18
Edad de Lupe = x = 18
Edad de Pilar = 2x/3 = 2(18)/3 = 36/3 = 12
Respuesta.
La edad de Pilar es de 12 años y la de Lupe es de 18 años