how do you find the net torque of a see saw?

Tp24

New member
Two children, with masses 33 kg (on the left) and 40 kg (on the right), sit at opposite ends of a 3.0 m long seesaw with mass 24 kg, with the fulcrum at its midpoint.
With the seesaw horizontal, find the net torque on the seesaw
With the seesaw horizontal, find its angular acceleration.

net torque is not zero btw
I thought that the net torque would be zero at equilbrium

explanation would help greatly
 
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