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Railways R.R.C. (Kolkata) Solved Paper Held on 2nd Shift 27-10-2013

  • question_answer
    While solving a problem, Samidha squared a number and then subtracted 25 from it rather than the required, i.e., first substracting 25 from the number and then squaring it. But she got the right answer. What was the given number?

    A) 13                                

    B) 38

    C) 48                                

    D) None of these

    Correct Answer: A

    Solution :

    Let the given number was x. As per question? \[{{(x)}^{2}}-25={{(x-25)}^{2}}\] \[{{x}^{2}}-25={{x}^{2}}+625-50x\] \[50x=625+25\] \[x=\frac{650}{50}\] \[x=13\]


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