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

  • question_answer
    8 bags of cattle feed are needed to feed 4 cows for 2 months. How long will the same feed last to feed 6 cows?

    A)  4 months                           

    B)  \[1\frac{1}{3}\] months               

    C)  1 months           

    D)         3 months

    Correct Answer: B

    Solution :

    Let the number of months be 'x? Number of cows and number of months the cattle feed last are inversely proportional. \[\therefore \]  \[4:6\,\,:\,\,\,:\,x:2\] \[\Rightarrow \]               \[x=\frac{4\times 2}{6}=1\frac{1}{3}\]months \[\therefore \]  The 8 bags of cattle feed last \[1\frac{1}{3}\] months to feed 6 cows.


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