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

  • question_answer
    100 litres of a mixture contains 10% water and rest milk. The amount of water that must be added so that the resulting mixture contains only 50% milk is__                                         

    A) 70 litres            

    B) 72 litres        

    C) 78 litres            

    D) 80 litres        

    Correct Answer: D

    Solution :

    The amount of water that must be added \[=\left( \frac{50-10}{100-50} \right)\times 100\,\,litres\] \[=\frac{40}{50}\times 100\,\,litres\] \[=80\,\,litres\]


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