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El numero = x
El consecutivo del número = x + 1
x - (x + 1)/3 = 15
3x/3 - (x + 1)/3 = 15
(3x - (x + 1))/3 = 15
3x - x - 1 = 15 * 3
2x - 1 = 45
2x = 45 + 1
2x = 46
x = 46/2
x = 23
Respuesta.
El numero es el 23
El consecutivo es = x + 1
mcm = 3
3x - ( x+1) = 45
3x - x - 1 = 45
2x - 1 = 45
2x = 46
x = 23
El número buscado es 23