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

  • question_answer
    The number whose square is equal to the difference of the squares of 75.15 and 60.12 is ?

    A) 45.09               

    B) 46.09

    C) 47.09               

    D) 48.09

    Correct Answer: A

    Solution :

    \[{{(75.15)}^{2}}-{{(60.12)}^{2}}\] \[=\]\[(75.15+60.12)(75.15-60.12)\] \[=(135.27)(15.03)=2033\] \[\therefore \sqrt{2033}=45\](approx)


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