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First, let's calculate the torque caused by the weight at the given distance from the hinged end of the bar.
Torque = Force x Distance
Torque = 40 N * 0.2 m
Torque = 8 Nm
Now we need to find how much force the spring balance is applying in order to keep the bar in equilibrium state. This is given by the equation:
Force = Torque / Distance
Force = 8 Nm / 0.3 m
Force = 26.67 N
So the reading of the spring balance is 26.67 N.