I am creating a worksheet in TeX and would like to separate the questions using boxes. The attached file shows the box I have created to house the questions. I was wondering if anyone could write a code to describe a text box like this, as my skills aren't so advanced. The 'Q' should be centered as shown in the diagram and should only be slightly larger than the example text (which I've set at 12pt). 
The color of the shapes and text-box should be as they are in the diagram (dark grey). Since the problem is quite elaborate, I really would appreciate some help as I am struggling to code this myself.
