Answer :
Final answer:
When equal volumes of water at different temperatures are mixed, the resulting temperature is the average of the two initial temperatures. In this case, the temperature of the mixed waters will be between 20 degrees and 30 degrees celsius.
Explanation:
When one litre of water at 20 degree celsius is mixed with one litre of water at 30 degree celsius, the resulting temperature of the mixture is found by averaging the two initial temperatures. This is because the mixture has equal volumes of water at the two differing temperatures. The average temperature can be calculated as (20+30)/2, which is 25 degrees Celsius. Thus, the temperature of the mixture lies between 20 degree celsius and 30 degree celsius (Option C).
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