1.

A liquid "P" is1 (3) /(7)times as heavy as water and water is 1 (2)/(5) times as heavy as another liquid 'O'. The amount of liquid 'P' that must be added to 7 litres of the liquid 'Q' so that the mixture may weigh as much as an equal volume of water, will be

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ANSWER :`14 " LT "`


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