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    Question

    MI alone can do a work in 14 days and M2 alone can do

    the same work in 70 days. With help of M3, they finish the same work in 7 days. In how many days M3 alone can do the same work? 
    A 20 days Correct Answer Incorrect Answer
    B 17.5 days Correct Answer Incorrect Answer
    C 19 days Correct Answer Incorrect Answer
    D 21 days Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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