1. The problem statement, all variables and given/known data You pour a certain amount of water at 100C and an equal amount of water at 20C into an insulated container. THe final temperature of the mixture will be (a) 60C (b) Less than 60C (c) greater than 60C. 2. Relevant equations 3. The attempt at a solution I don't know what formula to use. Can someone give me a hint.