1. A mixture comprises water and liquids A and B. The volume of water is 1/3rd of the total mixture and the volume of liquids A and B are in the ratio 5:3. To remove the water, the mixture is passed through a porous medium which completely absorbs the water and partially absorbs liquid A. Altogether this porous medium absorbs 200 ml of the initial mixture. If the ratio of volume of liquids A and B in the residual concentrated mixture becomes 7:9 then find the volume of water absorbed by the porous medium.






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  • By: anil on 05 May 2019 02.34 am
    Liquids A and B are in the ratio 5:3. The volume of water is one-third the total mixture. 
    Let us assume the volume of the total mixture to be 24x.
    Volume of liquid A = 10x
    Volume of liquid B = 6x
    Volume of water = 8x

    The mixture is passed through some medium that absorbs water completely and some quantity of liquid A. 
    Water absorbed = 8x
    Let the amount of liquid A absorbed be y.

    8x+y = 200
    => y = 200-8x -----(1)
    It has been given that (10x-y)/8x  = 7/9

    Substituting (1), we get,
    (10x-200+8x)/6x = 7/9
    (18x-200)/6x = 7/9
    162x-1800=42x
    120x = 1800
    => x = 1800/120
    Amount of water absorbed = 8*1800/120 = 120 ml.
    Therefore, option E is the right answer. 

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