abstraction.rb

class Gamble
  def initialize(money, bets, drinks = false)
    @money = money
    @bets = bets
    @drinks = drinks
  end

  def total_money_left
    money_for_betting + money_for_drinks
  end
end

private

def money_for_betting
  @money - @bets
end

def money_for_drinks
  money_to_spend = @drinks ? 8 : 6
end

startgamble = Gamble.new(1000, 500, true)
puts startgamble.total_money_left