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Edad del menor = 21 - x
21 - x = x/2
2(21 - x) = x
42 - 2x = x
42 = x + 2x
42 = 3x
42/3 = x
14 = x
Edad del mayor = 14 años
Edad del menor = 212 - x = 21 - 14 = 7 años
Respuesta.
La edad del mayor es de 14 años