A constant volume gas thermopmeter show...

A constant volume gas thermopmeter shows pressure reading of `50cm` and `90cm` of mercury at `0^(@)C` and `100^(@)C` respectively. When the pressure reading is `60cm` of mercury, the temperature is

`25^(@)C`

`40^(@)C`

`15^(@)C`

`12.5^(@)C`

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