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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    In a two digit number, ten's digit is twice the unit's digit. The number formed by interchanging the digits is 36 less than the original number. Find the number.

    A) 48                               

    B) 70

    C) 72                               

    D) 84

    Correct Answer: D

    Solution :

    10 1
    \[2x\] \[x\]
    The number is 21x If the digits are interchanged
    10 1
    \[x\] \[2x\]
    the number = 12x \[{{2}^{2x-y}}=32\] \[\Rightarrow \] \[{{2}^{2x-y}}={{2}^{5}}\] \[\Rightarrow \]  The number\[2x-y=5\]


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