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**1. The problem statement, all variables and given/known data**

*What would be the final temp if you mixed 1 liter of 20°C water with 4 liters of 40°C water?*

This question is very straightforward, and is, of course, assuming total conservation of temp.

(given mass m1 of water at a temperature T1 and mass m2 of water at T2, mix them together)

**2. Relevant equations**

My book mentions q=mc∆t, but using that equation, I get calories as the units. And this equation I barely know how to use.

**3. The attempt at a solution**

My guess is the answer is 38.75 °C, but I figured that by reasoning only, as I have no clue what equation to use. I wondered if it might be a proportions prob, but haven't gotten a logical answer that way. I know the answer has to be over 20°C but under 40°C.

I am very very confused, so a clear answer with an good explanation would be the best! Thanks very much!