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Railways R.R.C. (Jabalpur) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    20% of pure milk is taken and same amount of water is given in a pot of pure milk. It this process is repeated thrice, what will be the amount of pure milk in the pot after this process?

    A) 58-8%              

    B) 51-2%

    C) 50-0%              

    D) 40-0%

    Correct Answer: B

    Solution :

    Required percentage\[=\]\[{{\left( 1-\frac{20}{100} \right)}^{3}}\times 100\] \[={{\left( \frac{4}{5} \right)}^{3}}\times 100\] \[=\frac{64}{125}\times 100\] \[=51.2%\]


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