Stationary Stone Bar

A uniform stone bar with a mass of 10 kg10\text{ kg} and a length of 10 m10\text{ m} has a pivot point that is 3 m3\text{ m} away from the nearest edge. Two weights, AA and BB, are hung onto the edges of the bar by massless springs where weight BB is hung on the edge farthest from the pivot point. If the mass of weight BB is 40 kg40\text{ kg}, what must the mass of weight AA be to prevent the bar from turning?

Assume g=9.81ms2g=9.81 \dfrac{\text m}{\text s^2}.

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