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El numero = x
1/4 del numero = 1/4 * x = x/4
x/4 + x = 25
x/4 + 4x/4 = 25
(x + 4x)/4 = 25
5x/4 = 25
5x = 25 * 4
5x = 100
x = 100/5
x = 20
Respuesta.
El numero es el 20