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      Question

      The average age of a class of 20 girls is 15 years. If 5

      new girls having average age of 10 years join the class, then the average age of the class becomes:
      A 15 years Correct Answer Incorrect Answer
      B 13.6 years Correct Answer Incorrect Answer
      C 16.5 years Correct Answer Incorrect Answer
      D 14 years Correct Answer Incorrect Answer

      Solution

      Total age of 20 girls = 20 ├Ч 15 = 300 years Total age of 25 girls = 300 + (5 ├Ч 10) = 300 + 50 = 350 years Therefore new average age = 350/25 = 14 years

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