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

    2. A.
    3
    B.
    6
    C.
    9
    D.
    5

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    Answer : Option A

    Explanation :

    Let the ten's digit be = x
    Unit's digit = y
    So, the number is = 10x +y
    The number obtained by interchanging the digits = 10y + x
    According to the question:
    (10x + y) - (10y + x) = 27
    10x + y - 10y - x = 27
    9x - 9y = 27
    (x - y) = 3
    ∴The difference between the digits of the numbers, i.e., (x - y) = 3.

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