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7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    After a deduction of 5% from a certain sum and then 10% from the remainder, a sum of Rs. 171 is left. What was the original sum?

    A)  Rs.200  

    B)         Rs.250  

    C)  Rs.150 

    D)         Rs.300

    Correct Answer: A

    Solution :

       Remaining   amount   after successive deduction of 5% and then 10% of original sum \[=\frac{(100-5)}{100}\times \frac{(100-10)}{100}\]\[\times \]original sum =171 \[\therefore \]Original sum \[=171\times \frac{100}{95}\times \frac{100}{90}\]                 \[=Rs.\,\,200\]


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