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    Question

    There were 25 workers to complete a job in 10 days. But

    after 4 days, 10 workers were reassigned. How many more days will be needed now?
    A 5 days Correct Answer Incorrect Answer
    B 4 days Correct Answer Incorrect Answer
    C 3 days Correct Answer Incorrect Answer
    D 7 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Assume efficiency of each worker = 'e' units/day

    Total work = 25 × 10 × e = 250e units

    Work completed in 4 days = 25 × 4 × e = 100e units

    Work remaining = 250e - 100e = 150e units

    Remaining workers = 25 - 10 = 15

    Time needed = 150e ÷ (15 × e) = 10 days

    Extra days = 10 - 6 = 4 days

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