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  3. 8th Class
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  5. Direct and Inverse Proportions

8th Class Mathematics Direct and Inverse Proportions Question Bank Direct and Inverse Proportions

  • question_answer
    John bought 9 bookstore 36. How much far should he pay for 5 such books?

    A)  \[Rs.\,18\]                         

    B)  \[Rs.\,12\]         

    C)         \[Rs.\,72\]         

    D)         \[Rs.\,20\]

    Correct Answer: D

    Solution :

    The number of books and their cost are directly proportional. \[\therefore \]  \[9:5\,\,\,:\,\,\,:\,\,\,36:x\] \[\Rightarrow \]               \[x=\frac{5\times 36}{9}=20\] \[\therefore \] Cost of 5 books \[=Rs.\,20\]


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