Multiple choice

In a collage, the total age of 75 professors is 2160. The average age of 25 professors is 24 years and the average age of another 25 professors is 30. Find the average age of remaining professors.

  1. 32.4

  2. 36.5

  3. 25.4

  4. 28.2

  5. None of these

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A Correct answer
Explanation

Total age for 75 professors = 2160. First 25: average 24, total = 25 × 24 = 600. Next 25: average 30, total = 25 × 30 = 750. Remaining 25 professors: total = 2160 - 600 - 750 = 810. Average = 810/25 = 32.4 years.