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El numero = x
La tercera parte del numero = x/3
La quinta parte del numero = x/5
x/3 + x/5 = 13
5x/15 + 3x/15 = 13
(5x + 3x)/15 = 13
8x = 13 * 15
8x = 195
x = 195/8
Respuesta.
x = 195/8
8x = 13.15
8x = 195