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Railways R.R.C. (Hajipur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer
    A positive number when decreased by 4, is equal to 21 times the reciprocal of the number. The number is?

    A) 7                                 

    B) 9

    C) 5                                 

    D) 3

    Correct Answer: A

    Solution :

    Suppose the number is x. Then,                \[x-4=\frac{1}{x}\times 21\]                         \[{{x}^{2}}-4x-21=0\]                         \[{{x}^{2}}-7x+3x-21=0\]                         \[(x-7)\,\,(x+3)=0\]                         \[x=7\]       


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