Multiple choice

The average age of 30 students in a class is 20 years. The average age of 25 students is 15. What is the average age of the remaining students?

  1. 42

  2. 54

  3. 34

  4. 45

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total age of 30 students = 30×20=600. Total age of 25 students = 25×15=375. Remaining students = 30-25=5. Total age of remaining = 600-375=225. Average age of remaining = 225/5=45.

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