2. Sample Papers
  3. Railways
  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
    The sum of the digits of a 3 digit number is subtracted from the number. The resulting number is always:

    A)  Divisible by 7   

    B)  Not divisible by 7

    C)  Divisible by 9

    D)  Not divisible by 9

    Correct Answer: C

    Solution :

    [c] Let the hundred?s, ten?s and units digit of the required number Be x, y and z respectively Then the number \[=100x+10y+z\]          ? (1) And sum of digits = x + y + z                 ? (2) According to the question, (1) ? (2) gives \[99x+9y=9(11x+y)\] Which is always divisible by 9.


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