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Como sabemos que un día tiene 24 horas, entonces = 24 - s
Resolvemos el ejercicio.
s / (24 - s) = 5/7
7 (s) = (24 - s) * 5
7s = 120 - 5s
7s + 5s = 120
12s = 120
s = 120/12
s = 10
Respuesta. 10 horas