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La mitad = m/2
La tercera = m/3
Resolvemos :
m/2 + m/3 = 20-----sacas el mcm de 2 y 3 = 6
3m + 2m
--------------- = 20
6
3m + 2m = 20 (6)
5m = 120
m = 120/5
m = 24
Solución : El número es = 24
(3x+2x)/6=20
(5x)/6=20
5x=120
x=24
6x=144