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Edad de Maria = x
Edad de Jorge = 3x
3x + x = 84
4x = 84
x = 84/4
x = 21
Edad de Maria = x = 21 años
Edad de Jorge = 3x = 3 * 21 = 63 años
Respuesta.
Jorge tiene 63 años y Maria 21
Maria = x
Maria + Juan = 84
x + 3x = 84
4x = 84
x = 21
Jorge = 3x = 3(21) = 63
Maria = x = 21