person.rb

class Person
  attr_accessor :first_name, :last_name, :gender, :age

  def initialize(first_name, last_name, gender, age)
     @first_name = first_name
     @last_name = last_name
     @gender = gender
     @age = age
  end

  def introduction
     puts "#{@first_name} #{@last_name} is a #{@age} year old #{@gender}"
  end
end

class Student < Person
  def action
    puts "#{@first_name} is learning"
  end
end

class Teacher < Person
  def action
    puts "#{@first_name} is teaching"
  end
end

p = Teacher.new "Ben", "Davis", "male", 37
s = Student.new "John", "Doe", "male", 15

people = [p, s]
people.each do |person|
  person.introduction
  person.action
end