8th Class Mathematics Comparing Quantities Question Bank Comparing Queantities

  • question_answer If 20% of a = b, then b% of 20 is the same as

    A)  4% of a   

    B)  5% of a

    C)  20% of a                     

    D)  none of these

    Correct Answer: A

    Solution :

    (a): 20% of a =b \[\Rightarrow \frac{a}{5}=b\] b% of \[20=\frac{b}{100}\times 20=\frac{b}{5}=\frac{1}{5}\times \frac{a}{5}\]\[=\frac{a}{25}\] Now, \[\frac{a}{25}=\frac{4a}{100}=4%\,\text{of}\,a.\]


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