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x: Aprobados
y: Suspenso
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x + y = 80
4y = x
Sustitución:
x + y = 80 x + y = 80
4y + y = 80 x + 16 = 80
5y = 80 x = 64.
y = 80/5
y = 16
El número de aprobados es 64 alumnos, y de suspenso son 16 alumnos.