How Do You Calculate Reaction Forces in Equilibrium Problems?

[tfox]

Hi I got this question from the January 2004 BC Provincial Exam. It's question # 14. I have attached the question and picture. The answer key says B which is 1.6m but what is the solution?

 

[Jmf]

Do you know how to find the reaction force at each of the two supports?

What do you think happens to the reaction at A when it tips?