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    Question

    A tank has a pipes attached to it, out of which 2 are

    outlet pipes and the rest are inlet pipes. Each inlet pipe can fill a tank in 10 hours and each outlet pipe can empty the fall tank in 15 hours. When all the pipes are opened together then 91(2/3)%┬а part of the tank is filled in 2(1/2)┬а hours. What is the vase of n?
    A 9 Correct Answer Incorrect Answer
    B 8 Correct Answer Incorrect Answer
    C 6 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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