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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
    Twenty women can do work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman?

    A)  3 : 4                            

    B)  4 : 3

    C)       5 : 3                            

    D)  data inadequate

    Correct Answer: B

    Solution :

    (b): One women can do work in \[20\times 16=320days\] In 1 day, 1 woman can do \[\left( \frac{1}{320} \right)\] part of work Similarly, 1 man can do work in \[16\times 15=240\] days \[\therefore \]In 1 day, one man can do \[\frac{1}{240}\] part of work Capacity of man: woman \[=\frac{1}{240}:\frac{1}{320}=\frac{1}{3}:\frac{1}{4}=4:3\]


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