Determine the original temperature of a 560-g piece of lead placed in a 165-g brass calorimeter that

Question:

Determine the original temperature of a 560-g piece of lead placed in a 165-g brass calorimeter that contains 325 g of water. The initial temperature of the water and calorimeter was 18.0°C. The final temperature of the lead, calorimeter, and water is 31.0°C.