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One litre of water at 30^@C is mixed wi...

One litre of water at `30^@C ` is mixed with one litre of water at `50^@C`. The temperature of the mixture will be

A

80°C

B

more than `50 °C` but less than `80 °C`

C

`20 °C`

D

between `30°C` and `50 °C`

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