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      Question

      The average age of a class of 23 girls is 15 years. If 2

      new girls having average age of 10 years join the class, then the average age of the class becomes:
      A 17.5 years Correct Answer Incorrect Answer
      B 13.6 years Correct Answer Incorrect Answer
      C 15.2 years Correct Answer Incorrect Answer
      D 14.6 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total age of 23 girls = 23 ร— 15 = 345 years Total age of 25 girls = 345 + (2 ร— 10) = 365 years Therefore new average age = 365/25 = 14.6 years

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