Hi MacB,
We have rules about not helping with homework, but you seem to be making an effort to work through things, so I can give you a little hint.
This is all about Moments, as in levers etc.
I would also have you note that a Newton is a unit of Force, so think about unit conversions.
That should get you started, but by all means come back and ask questions with examples of what you are doing and maybe, then we can guide you a little more. I can assure you though, there will be no outlined solution to answer your problem as it is against or TOS.