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10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank MCQs - Pair of Linear Equations in Two Variables

  • question_answer
    The difference between a two digit number and the number obtained by interchanging the digits is 27. What is the difference between the two digits of the number?

    A) 9

    B) 6

    C) 12

    D) 3

    Correct Answer: D

    Solution :

    [d] Let number is \[10x+y\] (x, y are the digits).
    Number obtained by interchanging the digits \[=10x+y\]
    \[10x+y-(10y+x)=27\]
    \[9(x-y)=27\]
    \[x-y=3\]


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