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El número que buscamos es = s
La mitad del número es = s/2
Resolviendo tenemos que:
s + s/2 = 378
(s * 2 + s)/2 = 378
(2s + s)/2 = 378
3s = 2 (378)
3s = 756
s = 756/3
s = 252
Respuesta.
El número es 252