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

  • question_answer In a camp there is sufficient food for 105 soldiers for 21 days. If 42 soldiers leave the camp, how long would the food last?

    A)  30                  

    B)         35      

    C)  65                  

    D)         45      

    Correct Answer: B

    Solution :

    Let number of days = y
    Soldiers 105 105-42=63
    Days 21 y
    It is a case of inverse proportion. Hence, \[105\times 21=63\times y\] Or \[y=\frac{105\times 21}{60}=35\]


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