Lösung: Vererbung

```ruby class Mensch attr_reader :name, :alte

def initialize(name, alter) @name, @alter = name, Integer(alter) end

def to_s "#{@name}, Alter: #{@alter}" end end

class Student < Mensch attr_reader :matrikel_nr

def initialize(name, alter, matrikel_nr) super(name, alter) @matrikel_nr = matrikel_nr end

def to_s super + ", Matrikel-Nr.: #{@matrikel_nr}" end end

s = Student.new('Emil Meier', 22, '1822233')