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5th Class Mathematics Number System and its Operations Question Bank Number System

  • question_answer
    Sum of a number of two digits and the number obtained by reversing the digits of the first number is 110. If the difference of the digits is 4, then the number is

    A) 62                               

    B) 73 

    C) 84                               

    D) 51

    Correct Answer: B

    Solution :

    Let the two digit number be 10 x + y Reversing the digit, number become 10 y + x. sum = 10 x + y + 10y + x \[\Rightarrow \]   11x + 11y = 110 \[\Rightarrow \]   x + y = 10               ?(1) x - y = 4 (Given)         ?(2) From equ. (1) & (2) \[2x=14\Rightarrow x=7\] \[\therefore \] y = 3 Hence the number is 73.          


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