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Reprobados: x
Aprobados: 4x + 5
Si en el grupo hay 60 alumnos:
Reprobados + Aprobados = Total de alumnos
x + 4x + 5 = 60
5x + 5 = 60
5x = 60 - 5
5x = 55
x = 55/5
x = 11
Remplazas:
Reprobados: x = 11
Aprobados: 4x + 5 = 4(11) + 5 = 44 + 5 = 49
RTA:
49 aprobaron geografía.