Thank you all for the responses!
Harry Burns: The exam is for a Commercial Pilot rating.
john_tullamarine: In your first explanation, I understood everything but the "FS scale" part. I'm not familiar with this "FS" acronym. What does it stand for?
The answer seems just about right, there was the 21% answer.
Now, on a side question, forgive my physics knowledge, but I can't quite grasp the understanding of finding the CG by dividing the total moment with the total mass.
What is the logic or reasoning behind it? I know it's standard CG calculation, but in my books I can't find the explanation for the calculations.
Again thank you all, it's amazing how many people are willing to help here!
I only hope that I can contribute too.