Answer :
The equilibrium temperature can be used to determine the amount of heat transferred.
Heat transfer
The question is incomplete but I will try to explain to you the principle of heat transfer. Heat is a form of energy that exists due to temperature difference between two bodies. A calorimeter is used to measure the heat absorbed or emitted.
When the metal from boiling water was transferred to water at room temperature, heat was transferred to it and a thermal equilibrium was attained. This equilibrium temperature can now be used to determine the amount of heat transferred.
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