A 873 g copper pan is removed from the stove at a temperature of 150 C. It is then stacked on top of a 691 g aluminum sheet at room temperature, 25 C. The specific heat capacity for copper is 0.387 JgK and that for aluminum is 0.904 JgK . Assume no heat is gained or lost to the surroundings.

What is the final temperature ( f ) of the two objects after thermal equilibrium is reached?