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Banking Quantitative Aptitude Sample Paper Quantitative Aptitude Sample Paper-45

  • question_answer
    The difference between a two-digit number and the number obtained by interchanging the two digits of the number is 9. What is the difference between the two digits of the number?                     [IBPS (PO) 2011]

    A) 3                                 

    B) 2     

    C) 1         

    D) 4

    E) None of these

    Correct Answer: C

    Solution :

    Let the number be \[10x+y.\]
    The number by interchanging the position of the digit
    \[=10y+x\]
    Now, \[(10x+y)-(10y+x)=9\]
    \[\Rightarrow \]   \[9x-9y=9\]
    \[\Rightarrow \]   \[9\,\,(x-y)=9\]\[\Rightarrow \]\[(x-y)=1\]


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