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      Question

      7 years ago, the average age of a family of four persons

      was 30 years. In between these 7 years the family adopted a girl. Now at present the average age of the family is same as it was 7 years ago. Find the present age of the girl. TYPE 35
      A 5 years Correct Answer Incorrect Answer
      B 6 years Correct Answer Incorrect Answer
      C 2 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 = 4 x (30 + 7) = 148 years Sum of the present age of the family including girl = 5 x 30 = 150 years Present age of the girl = 150 тАУ 148 = 2 years

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