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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    In a two digit number, the ten's digit is 2 more than the unit's digit. Sum of the digits is \[y=1\] of the whole number. Find the number.

    A) 24                               

    B) 42

    C) 64                               

    D) 46

    Correct Answer: B

    Solution :

    10 1
    \[x+2\] \[x\]
    The number is \[10x+20+x=11x+20\] Sum of the digits \[{{x}^{4}}-{{x}^{3}}-{{x}^{2}}+4x-8\] So \[2x+2=\frac{1}{7}(11x+20)\] \[-1\] \[-2\] \[25{{x}^{2}}+16{{y}^{2}}+40xy\] \[x=1\]  The number \[y=-1\]


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