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10/40x+ 4/40x = 210
14/40x = 210
x = 210*40/14
x= 600
El número = x
La cuarta parte del número = x/4
La decima parte del número = x/10
x/4 + x/10 = 210
5x/20 + 2x/20 = 210
(5x + 2x)/20 = 210
7x/20 = 210
7x = 210 * 20
x = (210 * 20)/7 Simplificas el 7
x = 30 * 20
x = 600
Respuesta.
El número es el 600