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suerte
edad del abuelo = 40+x
el dato dice que:
1/4 * (x + 40+x) = x
40 + 2x = 4x
40 = 4x - 2x
40 = 2x ---------> x = 40/2 ----> x = 20 años
Rpta: Edad de Hector es 20 años