using System;

public class Program

{

    public static void Main()

    { 

         double dan = 4.5;

        double joe = dan + 3;

        double tom = joe*2;

        double dan10 = 10 + 4.5;

        double joe10 = joe + 10;

        double tom10 = tom + 10;

        Console.WriteLine(" in ten years dan will be " + dan10 + " years old , joe will be  " + joe10 + " years old, and tom will be " + tom10  + " years old");

        double overAllAges =  dan10 + joe10 + tom10 ;

        double avrageAge = overAllAges/3 ;

        Console.WriteLine (" the avrage age is " + avrageAge + " years old") ;

​

    }

}