ruby programm to return array of text and its value, can be used as alterantives to captcha. Example: [4, "four divided by one"] , [0, "eight minus eight"] , [6, "two plus four"]

captcha.rb

class Captcha
  def initialize
    @numbers=[1,2,3,4,5,6,7,8,9]
    @numbers_alpha={
      1 => "one",
      2 => "two",
      3 => "three",
      4 => "four",
      5 => "five",
      6 => "six",
      7 => "seven",
      8 => "eight",
      9 => "nine"
    }
    @ops={
      "+" => "plus",
      "-" => "minus",
      "*" => "multiplies",
      "/" => "divided by"
    }
  end
  
  def array

    digit1=@numbers[rand(9)]
    digit2=@numbers[rand(9)]
    op=@ops.keys[rand(4)]

    val = eval "#{digit1}#{op}#{digit2}"
    captcha_text = "#{@numbers_alpha[digit1]} #{@ops[op]} #{@numbers_alpha[digit2]}"

    return val,captcha_text

  end

end
a=Captcha.new.array
puts a.inspect