encapsulation.rb

class ObscuringReferences
  attr_reader :data
  def initialize(data)
    @data = data
  end

  def diameters
    data.collect { |cell|
      cell[0] + (cell[1] * 2) }
  end
end

new_var = ObscuringReferences.new([[25,20],[65,34]])
puts new_var.diameters