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Edad de Alejandro = x
Edad de Arianne = 24 - x
Edad de Alejandro
Razon = --------------------------------
Edad de Arianne
x
Razon = --------------
24 - x
La proporcion.
x 4
------------ = --------
24 - x 8
8x = 4(24 - x)
8x/4 = 24 - x
2x = 24 -x
2x + x = 24
3x = 24
x = 24/3
x = 8
Edad de Alejandro = 8 años
Edad de Arianne = 24 - 8 = 16 años