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      Question

      The average age of a class of 20 girls is 16 years. If 4

      new girls having average age of 10 years join the class, then the average age of the class becomes:
      A 12 years Correct Answer Incorrect Answer
      B 16 years Correct Answer Incorrect Answer
      C 15 years Correct Answer Incorrect Answer
      D 14 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total age of 20 girls = 20 Γ— 16 = 320 years Total age of 24 girls = 320 + (4 Γ— 10) = 360 years Therefore new average age = 360/24 = 15 years

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