What equation can I use to allow me to mix water of different temperatures together to get a certain temperature as a result?

I.e. I have ‘X litres’ at 5 degrees C and I have ‘Y litres’ water at 10 degrees C. How can I find out the ratio in which to mix them to get a specific temperature?

e.g. 5 litres at 5 degrees C + 5 litres at 10 degrees C = 10 litres at 7.5 degrees C.

What if I want 6.5 degrees C? Or 8 degrees C?*– Mark, via the ask a science question page.*

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