self Maths Puzzle

pure milk contains 89% of water.How much water has been added to pure milk to form a sample of 22 litre milk containing 90% water.

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self Other Question

12,6.5,7.5,12.75,27.5,71.25,?
what will be the next no???????
what is the compound interest on one lakh rupees after 9 months if the interst at the rate of 8% per annum is payable after every 3 months