7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer When a number is reduced by 5, it becomes 80% of itself. Find the number.

    A)  25  

    B)  30

    C)  20                               

    D)  50

    Correct Answer: A

    Solution :

    (a) Let the number be\[x\]. Then \[x-5=80%\] of \[x\Rightarrow x-5=x\times \frac{80}{100}\] \[\Rightarrow \]\[x-5=\frac{4}{5}x\Rightarrow x-\frac{4}{5}x=5\] \[\Rightarrow \]\[\frac{1}{5}x=5\Rightarrow x=25\]                       

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