Torque on a Dam

Water exerts a force on the dam. It also exerts a torque about the axis passing through O in the figure. The net force the water exerts on the dam can be modeled to act at a height \(\frac{a}{b}H\) above O (So the torque exerted by the water is \(\frac{a}{b}FH\)). What is \(a+b\)?

You can neglect the atmospheric pressure as it acts on both sides of the dam

This Problem is taken from Physics for Scientists and Engineers with Modern Physics

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