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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 & Inverse Proportional (Time & Work)

  • question_answer
    If 40 men can complete a work in 10 days working 10 hours a day, then find the number of men is required the work in 5 days if they work 10 hours in a day.

    A)  100 men          

    B)  60 men  

    C)  150 men                      

    D)  80 men

    Correct Answer: D

    Solution :

    (d): 40 men, 10 days, 10 hours \[\Rightarrow \] I work \[\Rightarrow \]1 man, I day, I hour \[=\frac{1}{40\times 10\times 10}\]work Let no of men required be 'x' \[\therefore \] x men, 5 days, 10 hours \[=\frac{x\times 5\times 10}{4000}\]work. But \[\frac{50x}{4000}=1\]work. \[\Rightarrow \] \[x=4000/50-80\] men.


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