Single Responsibility coding challenge

single_responsibility.rb

class AritmeticCalculation
  attr_reader :math_operation, :numbers
  def initialize(math_operation:, numbers:)
    math_operation = math_operation
    numbers = numbers || []
  end

  def run_math
    case math_operation
      when "sum"
        puts "the operation will be SUM"
        numbers.inject(&:+)
      when "subs"
        puts "the operation will be SUBTRACTION"
        numbers.inject(&:-)
      when "div"
        puts "the operation will be DIVISION"
        numbers[0] / numbers[1]
      when "mult"
        puts "the operation will be MULTIPLICATION"
        numbers.inject(&:*)
      else
        raise "Invalid Operation"
      end
    end
  end
end