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  5. Pair of Linear Equations in Two Variables

10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank MCQs - Pair of Linear Equations in Two Variables

  • question_answer
    In a number of two digits, unit's digit is twice the tens digit If 36 be added to the number, the digits are reversed. The number is:

    A) 36

    B) 63

    C) 48

    D) 84

    Correct Answer: C

    Solution :

    [c] Let unit's digit: x                                         
    Tens digit: y
    Then,  \[x=2y\]
    Number \[=10y+x\]
    Also,    \[10y+x+36=10x+y\]
                \[9x-9y=36\]
    or         \[x-y=4\]
    Solve.   \[x=2y\]
    0\[x-y=4\]


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