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El numero = x
El 20% del numero = 20% de x = 20% * x = 20/100 * x = 20x/100
20x/100 + 27 = 57
20x/100 = 57 - 27
20x/100 = 30
20x = 30 * 100
20x = 3000
x = 3000/20
x = 150
Respuesta.
El numero es el 150