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  3. 9th Class
  4. Mathematics
  5. Linear Equations in Two Variables

9th Class Mathematics Linear Equations in Two Variables Question Bank Linear Equation in two Variables

  • question_answer
    A student was asked to find the value of \[\frac{\mathbf{3}}{\mathbf{7}}\] of a sum of money. The student made a mistake by dividing the sum of \[\frac{\mathbf{3}}{\mathbf{7}}\] and then got an answer which exceeded the correct answer by Rs. 80. The correct answer was:

    A)  Rs. 42                         

    B)  Rs. 24

    C)  Rs.81                          

    D)  Rs. 18

    Correct Answer: D

    Solution :

    (d): Let the sum be x Then \[\frac{7x}{3}-\frac{3}{7}x=80\] \[\Rightarrow \frac{40x}{21}=80\] \[\Rightarrow x=42\] \[\therefore \]required sum is \[42\times \frac{3}{7}~=Rs.18\]


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