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      Question

      A group of 35 people has an average age of 28 years.

      Later, 7 more people join the group and the average age becomes 25 years. What is the average age of the new people?
      A 8 years Correct Answer Incorrect Answer
      B 9 years Correct Answer Incorrect Answer
      C 10 years Correct Answer Incorrect Answer
      D 11 years Correct Answer Incorrect Answer

      Solution

      Initial sum = 35 Ă— 28 = 980 years
      New average = 25 years
      New total = 42
      New total age = 42 Ă— 25 = 1050 years
      Sum of new = 1050 - 980 = 70 years
      Average = 70 Ă· 7 = 10 years

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