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Ruby code posted
created at 07 May 22:03

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class Gear
  attr_reader :chainring, :cog

  def initialize(chainring, cog)
    @chainring = chainring
    @cog = cog
  end

  def ratio
    chainring / cog.to_f
  end
end

Gear.new(52, 11).ratio #=> 4.72..
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