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30------------100
6------------x
100×6
x= ----------
30
x= 600
-------
30
x=20
Rpta: Faltaron el 20%.
100porciento --------------son 30 alumnos
porcentaje ? ------------ faltan 6 alumnos
entonces multiplicamos 6 alumnos ×100 porciento ÷30 alumnos
eso es igual a = 20 porciento de la clase faltaron