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    Question

    Priya, Riya, and Supriya can complete a piece of work

    individually in (20/3) days, 20 days, and 25 days, respectively. If they work together, how many days will it take for them to complete 84% of the work?  
    A 4 days Correct Answer Incorrect Answer
    B 5 days Correct Answer Incorrect Answer
    C 4.5 days Correct Answer Incorrect Answer
    D 3.5 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let total amount of work = 100 units (LCM of 20/3, 20 and 25) Efficiency of Priya = 100/(20/3) = 15 units per day Efficiency of Riya = 100/20 = 5 units per day Efficiency of Supriya = 100/25 = 4 units per day Amounts of work to be completed = 0.84 × 100 = 84 units Desired time = 84/(15 + 5 + 4) = 3.5 days

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