using System;

​

public class Program

{

    public static void Main()

    {

        int[, ] marks = new int[2, 10];

        int total_class1 =0;

        int total_class2 = 0;

        int total = 0, total_two = 0;

        for (int i = 0; i < 2; i++)

        {

            for (int j = 0; j < 2; j++)

            {

                Console.WriteLine("enter in a mark: ");

                marks[i, j] = int.Parse(Console.ReadLine());

            if (i == 1) {

            total_class1 = total_class1 +  marks[i, j];

            }

            if (i == 1) {

            total_class2 = total_class1 + marks[i, j];

            }

            }

        }

        total = total_class1/10;

        total_two = total_class2/10;

        Console.WriteLine("class average for 1: " + total );

        Console.WriteLine("class average for 2: " + total_two );    

        }

}

​

​

​