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SSC Sample Paper Mock Test-14 SSC CGL Tear-II Paper-1

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

    A)  \[\frac{8}{15}\]

    B)  \[\frac{7}{15}\]

    C)  \[\frac{1}{4}\]

    D)  \[\frac{1}{10}\]

    Correct Answer: B

    Solution :

    A' s work per day \[=\frac{1}{15}\] B's work per day \[=\frac{1}{20}\] (A+B)'s work per day \[=\frac{1}{15}+\frac{1}{20}=\frac{7}{60}\] \[\therefore \] (A + B)'s work in 4 days \[=4\times \frac{7}{60}=\frac{7}{15}\]


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