C# Employment Question - Find sum

static void Main(string[] args)
{
    static (int, int) TwoSum(int[] nums, int sum)
    {
        for (int i = 0; i < nums.Length; i++)
        {
            for (int j = 0; j < nums.Length; j++)
            {
                if(sum == (nums[j] + nums[i]))
                {
                    return (j, i);
                }
            }
        }
        return (0, 0);
    }
    int[] numbers = { 14, 2, 6, 18, 11, 4, 9, 12, 3, 15 };
    var (i, x) = TwoSum(numbers, 13);
    Console.WriteLine("The two numbers are: {0} and {1}", numbers[i], numbers[x]);
}