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x=?
total de alumnos
18*100/30
1800/30
60
60-18=42
en 1 hay un total de 60 estudiantes
y hay 42 chicas
30% de x = 18
30% . x = 18
30x/100= 18
30x = 18*100
x = 1800/30
x = 60
El total de alumnos es de 60