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    Question

    Together, Ali and Imran take 40 days to complete a project.

    After working jointly for 32 days, they left, and Zara completed the remaining work in 4 days. How much time would Zara take to complete 70% of the work on her own?
    A 10.8 Correct Answer Incorrect Answer
    B 32.5 Correct Answer Incorrect Answer
    C 62.5 Correct Answer Incorrect Answer
    D 28.4 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Fraction of work done by Ali and Imran = 32 / 40 = 4/5

    Fraction of work done by Zara = 1 - 4/5 = 1/5

    So, number of days taken by Zara alone to complete the entire work = 4 ÷ (1/5) = 20 days

    So, time taken by Zara to complete 70% of the work = 20 × 0.70 = 14 days

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