Posted by Ryan on Tuesday, October 18, 2011 at 4:07pm.
Because you're just mixing water, the specific heat is the same for both liquids. So, it's just like adding a bunch of weighted numbers:
(320*25 + 110*95)/(320+110) = 42.91°C
You can use a fancy formula incorporating the specific heats, but they all cancel out in the end, since they're the same.
As a ballpark check, the average of 25 and 95 is 60°C, but you have more cool water than hot, so the result will be below the average.
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