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The colder water will warm up (heat energy "flows" into it). The warmer water will cool down (heat energy "flows" out of it).
So 1 litre of water (20⁰C) mixed with 1 litre of water (30⁰C)
the answer will be 25⁰C.

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When water A at 20°C is added to water B at 30°C then heat from B flows to A.the final tenperature of the mixture would be (20+30)/2 = 25°C.
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