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  1. A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. Find the number.

    2. A.
    18
    B.
    24
    C.
    42
    D.
    81

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    Answer : Option B

    Explanation :

    Let the ten's and unit digit be x and , respectively.

    10x2 + 8 + 18x = 80 + x2
    9x2 + 18x - 72 = 0
    x2 + 2x - 8 = 0
    (x + 4)(x - 2) = 0
    x = 2.

    Ten's place= 2
    Unit's place = 8/2 = 4
    So, the number is 24.

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