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    Question

    Changu & Mangu can do a work in 20 & 30 days. Both

    together start the work. After some days Changu left the work. The rest work done by Mangu in 10 days. After how many days Changu left the work.
    A 4 days Correct Answer Incorrect Answer
    B 6 days Correct Answer Incorrect Answer
    C 8 days Correct Answer Incorrect Answer
    D 2 days Correct Answer Incorrect Answer

    Solution

    The correct answer is C

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