A bottle is full of Dettol. 1/3 of it is taken out and then an equal amount of water is poured into bottle to fill it. This operation is done 4 times. Find the final ratio of Dettol and water in the bottle?

• 16/65
  
  At every taking out of 1/3 of solution, the quantity remains 2/3 of the original
  If original quantity of mixture=x, then after 4 successive taking out of 1/3 of mixture, Quantity of dettol remained=x*(2/3)(2/3)(2/3)(2/3)=16x/81 and remaining 65x/81 will be water
  So ratio of Dettol to water= (16x/81)/ (65x/81)=16/65
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