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El numero = x
x + 25% x = 400
x + 25/100 * x = 400
x + 25x/100 = 400 Simplificas 25/100 = 1/4
x + x/4 = 400
4x/4 + x/4 = 400
(4x + x)/4 = 400
5x/4 = 400
5x = 400 * 4
5x = 1600
x = 1600/5
x = 320
Respuesta.
El numero es el 320