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8th Class Mathematics Direct and Inverse Proportions Question Bank Direct & Inverse Proportional (Time & Work)

  • question_answer
    A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of work that is left is:

    A)  \[1/4\]             

    B)  1 /10          

    C)  7/15                            

    D)  8/15

    Correct Answer: D

    Solution :

    (d): Work done by A + B in 1 days \[=\frac{1}{15}+\frac{1}{20}\]. Work done by A + B in 4 days = \[=4\left( \frac{1}{15}+\frac{1}{20} \right)=\frac{28}{60}=\frac{7}{15}\]work. \[\Rightarrow \] work left = 8/15 part.


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