Please view photo attachment; all question information is there

What do YOU think ?
While we're happy to HELP we won't do all the work for you.
Show us what you have done and where you are having problems..

N(BT)= mg + 2Mg/3
T= Mg/3

I figured it out. Thanks for the push. Lol xD
But, I do have another question that I really don't understand how to start. :/
My brain is probably fried from this question.