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La tercera = m/3
La cuarta = m/4
Resolvemos.
m/3 + m/4 = 40---sacas el mcm de 3 y 4 = 12
4m + 3m
--------------- = 40
12
4m + 3m = 40 (12)
7m = 480
m = 480/7
Solución. El número es 480/7