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      Question

      A person has three iron bars whose lengths are 20, 30

      and 40 metres, respectively. He wants to cut pieces of the same length from each of the three bars. What is the least number of total pieces if he cuts without any wastage?
      A 8 Correct Answer Incorrect Answer
      B 10 Correct Answer Incorrect Answer
      C 9 Correct Answer Incorrect Answer
      D 11 Correct Answer Incorrect Answer

      Solution

      The correct answer is C

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