Problem 5 on Project Euler

p5.rb

class Numeric
  def divisible_by? num
    self % num == 0
  end
end

possible = increment = 20 * 19
test = (11..18).to_a.reverse
loop do
  if test.all? {|d| possible.divisible_by? d}
    puts possible
    exit
  end
  possible += increment
end