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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)%  part of the tank is filled in 2(1/2)  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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