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      Question

      The average age of a group of 20 persons is found

      to be 25 years. Later it is found that age of two of the persons is calculated as 30 and 60 instead of 70 and 20. Find the correct average age of the group.
      A 28 years Correct Answer Incorrect Answer
      B 25 years Correct Answer Incorrect Answer
      C 29 years Correct Answer Incorrect Answer
      D 22 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Required average = {(20 × 25) – 30 – 60 + 70 + 20}/20 = 25 years

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