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El numero que no conoce lo llamas x
14 = 20% de 70% de 25% de x
14 = 20% * 70% * 25% * x
14 = 20/100 * 70/100 * 25/100 * x
14 = (20 * 70 * 25 * x)/(1000000) Simplificas ceros
14 = (2 * 7 * 25x)/10000
14 * 10000 = 350x
140000/350 = x
400 = x
x = 400
Respuesta.
El numero es el 400