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  3. 8th Class
  4. Mathematics
  5. Linear Equations in One Variable

8th Class Mathematics Linear Equations in One Variable Question Bank Linear Equations in one Variable

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

    A)  Rs. 42                         

    B)  Rs. 24          

    C)  Rs. 81             

    D)  Rs. 18

    Correct Answer: D

    Solution :

    (d): Let sum be 'x' Now, \[\frac{x}{3/7}-\frac{3}{7}\times x=80\] \[\Rightarrow \frac{7x}{3}-\frac{3x}{7}=80\] \[\Rightarrow 40x=1680\] \[x=42\] \[\therefore \frac{3}{7}x=18.\]


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