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Sagot :
Tenemos un problema sobre porcentajes. Veremos que la calificación del alumno es un 80%.
En este caso sabemos que la prueba tiene 70 preguntas, por lo que la cantidad de referencia (el 100%) será 70.
Y sabemos que el estudiante responde correctamente 56 preguntas.
Lo que queremos hacer es ver que porcentaje representa este segundo número.
Para ver esto planteamos dos ecuaciones:
56 = x
70 = 100%
Para resolver esto, debemos ver el cociente entre esas ecuaciones:
56/70 = x/100%
Ahora resolvemos para x:
(56/70)*100% = x = 80%
Es decir, el alumno obtiene una clasificación del 80%.
Si quieres aprender más puedes leer:
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