How Do You Calculate Reaction Forces in Equilibrium Problems?

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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?
 

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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?