private static string GetExercise7Text(Academy academia) { var exercise7Text = new StringBuilder(); exercise7Text.AppendLine("Datos de la academia --------------------------"); exercise7Text.AppendLine($"Media de las aulas: {String.Join(" / ",academia.GetAverageOfTheClassrooms())}"); exercise7Text.AppendLine($"Número de hombres: {academia.GetNumberOfAlumno('H')}"); exercise7Text.AppendLine($"Número de mujeres: {academia.GetNumberOfAlumno('M')}"); return(exercise7Text.ToString()); }