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     EduGorilla 
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    A vessel contains x litres of alcohol and another contains y litres of water. Pran takes out z litres from each vessel and transfers it to the other (alternatively). If he has to ensure that the percentage quantity of wine remains the same in both the vessels after the the first operation, then 

    Options :-

    1. z(x + z) = xy
    2. z (x + y) = xy
    3. xz = x + y
    4. uz = x + y
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