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n = 50
3/10 . 50
3(50)/10
15
El número = x
Los 4/5 de x = 40
4/5 * x = 40
4x/5 = 40
4x = 40 * 5
x = (40 * 5)/4 Simplificas el 4
x = 10 * 5
x = 50
Los 3/10 de 50 =
3/10 * 50 =
(3 * 50)/10 = Simplificas el cero
3 * 5 =
15
Respuesta.
15