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

  • question_answer
      Ravi and Sonu can do a job alone in 20 days and 30 days respectively. In how many days the job will be finished, if they work together?

    A)  10 days             

    B)  12 days     

    C)  8 days                         

    D)  13 days

    Correct Answer: B

    Solution :

    (b): Ravi: 20 days \[\Rightarrow \] 1 job I day \[\Rightarrow 1/20\]job Sonu: 30 days \[\Rightarrow \] 1 job 1 day \[\Rightarrow 1/30\] job Together in, 1 day \[\Rightarrow \Rightarrow 1/20+1/30=\frac{5}{60}\]job   \[\therefore \]1 job together in \[\frac{5}{60}=12\]days.


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