Simple problems resolved

Good morning!

I added the files with the solutions.
They were created in Visual Studio 2010.

Here is a print screen of the VS Solution if you want to reproduce it:
![vs_solution](https://cloud.githubusercontent.com/assets/8064846/3478786/0748603c-0344-11e4-9cd8-14a79bd121ac.png)

The UnitTests project needs a reference to the SimpleProblems project.

Thank you for your time.
I have used your suggestion of extended methods:
public static bool IsEven(this int val)
        {
            if (val % 2 == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

I have implemented it and it works like a charm. Thanks.