using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

       LinkedList<Pair> Pairs = new LinkedList<Pair>();

       Pair pair = new Pair() { num1 = 1, num2 = 5 };

​

       Pairs.AddFirst(pair);

       Pairs.AddLast(pair);

       Pairs.AddLast(pair);

       Console.WriteLine(Pairs.Sum(x => x.num1 + x.num2) / Pairs.Count);

    }

    public class Pair // I know this isn't encapsulated; just a quick example

    {

       public int num1;

       public int num2;

    }

}