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A 50 g ice at 0^(@)C is added to 200 g w...

A 50 g ice at `0^(@)C` is added to 200 g water at `70^(@)C` taken in a flask. When the ice has melted completely, the temperature of the flask and the contents is reduced to `40^(@)C`. Now to bring down the temperature of the contents to `20^(@)C`, find a further amount of ice that is to be added.

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The correct Answer is:
`50g`
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