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Law of Conservation Energy?

Imagine that your water heater has broken, but you want to take a bath. You fill your bathtub with 25kg of room-temperature water (about 25 C). You figure that you can boil water on the stove and pour it into the bath to raise the temperature.

Part A - How much boiling water would you need in order to raise the bath to body temperature (about 37 C)? Assume that no heat is transferred to the surrounding environment.

Part B - The heat lost by the boiling water is equal to the heat gained by the room-temperature water. How much heat was transferred in this process?

I can't figure out part B, but I did solve for A. Please help with B!! ASAP

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