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La mitad = x/2
La tercera = x/3
Resolvemos :
x + x/2 + x/3 = 55
(2 * 3) x + 3x + 2x
----------------------- = 55
6
6x + 3x + 2x
---------------- = 55
6
6x + 3x + 2x = 330
11x = 330
x = 330/11
x = 30
Solución : El número es = 30