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  4. Quantitative Aptitude
  5. Number System and its Operations

Railways Quantitative Aptitude Number System and its Operations Sample Paper Number System Sample Test Paper-1

  • question_answer
    Two times a two-digit number is 9 times the number obtained by reversing the digits and sum of the digits is 9. The number is

    A)  72                   

    B)  54      

    C)  63                   

    D)  81

    Correct Answer: D

    Solution :

    [d] Let the unit and ten places of two digit number be x and y respectively. Then number will be 10y + x According to question 2 (10y + x) = 9 (10x + y)                      ? (i) and x + y = 9                                       ? (ii) From equation (i) and (ii), we get x=1 and y=8 Hence number = 81


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