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      Question

      9 years ago, the average age of a family of five persons

      was 50 years. In between these 9 years the family adopted a girl. Now at present the average age of the family is same as it was 9 years ago. Find the present age of the girl.
      A 5 years Correct Answer Incorrect Answer
      B 6 years Correct Answer Incorrect Answer
      C 3 years Correct Answer Incorrect Answer
      D 8 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Sum of the present age of the family excluding girl = 5 x (50 + 9) = 295 years Sum of the present age of the family including girl = 6 x 50 = 300 years Present age of the girl = 300 – 295 = 5 years

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