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Railways R.R.C. (Kolkata) Solved Paper Held on 17-11-2013

  • question_answer
    A boy was asked to multiply a number by 12. By mistake he multiplied the number by 21 and go this answer 63 more than the correct answer. The number was?

    A) 7                                 

    B) 8

    C) 9                     

    D)   12

    Correct Answer: A

    Solution :

    As per question? Let the number is x, then \[x\times 21-x\times 12=63\] \[\Rightarrow \]\[9x=63\] \[x=7\]


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