9gag

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _9gag
{
    class Program
    {
        static void Main(string[] args)
        {
            //http://9gag.com/gag/aVDbqxK
            //result: 3,50 4,50 9,50 3,50

            decimal a = 0.0m;
            decimal b = 0.0m;
            decimal c = 0.0m;
            decimal d = 0.0m;

            for (a = 1.0m; a <= 8.0m; a+=0.1m)
            {

                for (b = 1.0m; b <= 8.0m; b+=0.1m)
                {

                    for (c = 1.0m; c < 10.0m; c +=0.1m)
                    {

                        for (d = 1.0m; d <=8.0m; d +=0.1m)
                        {
                           // Console.WriteLine($"{a:f2} {b:f2} {c:f2} {d:f2}");

                            if ( (a+b) == 8.0m && (a+c) ==13.0m && (b+d) == 8.0m && (c - d) == 6.0m)
                            {
                                    Console.WriteLine($"{a:f2} {b:f2} {c:f2} {d:f2}");
                                    break;
                            }

                        }
                    }
                }
            }
        }
    }

}