Calculate the Calorimeter Constant?

A calorimeter is to be calibrated: 51.203g of water at 55.2°C is added to a calorimeter containing 49.783g of water at 23.5°C. After stirring and waiting for the system to equilibrate, the final temperature reached is 37.6°C. Calculate the calorimeter constant.



I'm totally stuck
Thank you in advance!
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