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      Question

      The average age of 15 girls is 45 years. If the age of

      one more girl is added the average decreases by half a year. What is the age of new girl?
      A 37 Correct Answer Incorrect Answer
      B 33 Correct Answer Incorrect Answer
      C 35 Correct Answer Incorrect Answer
      D 30 Correct Answer Incorrect Answer
      E 39 Correct Answer Incorrect Answer

      Solution

      Total age of 15 girls = 15 × 45 = 675 years   If the age of one more girl is added the average decreases by half a year,   ∴ Total age of 16 girls = 44.5 × 16 = 712    Now, Age of the new person = 712 – 675 = 37 years

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