Thank you for your answer Delta2. Was really helpful!
I understand what you mean. In fact the approach you mentioned is the one I thought first. I did it and the answer I got wasn't included on all the possible answers.
The other approach I posted above, with the ##r_{GA}## was based on an...
Problem illustration:
The possible answers are:
I don't understand why it says Mc if it is asking for the moment at A, not C. But maybe I am getting something wrong.
So with the formulas I posted above, I have this: