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  1. The difference between a two-digit number and the number obtained by changing the positions of its digits is 36. What is the difference between the two digits of that number?

    2. A.
    3
    B.
    4
    C.
    9
    D.
    Cannot be determined.
    E.
    None of these.

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    Answer : Option B

    Explanation :

    Let the number be = xy

    So, the ten's digit is x and the unit's digit is y.

    As per the question:

    (10x + y) - (10y + x) = 36
    10x + y - 10y - x = 36
    9x - 9y = 36
    9(x - y) = 36
    x - y = 4

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