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

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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