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Railways PYQCBT 1 2016

RRB NTPC · Question 81

If the average age of 20 students in Class I is 10 years and the average age of 25 students in Class II is 12 years, find the average age (in years) of all students. A. 11 B. 11.111 C. 10.50 D. 10.85

  1. D

  2. B

  3. A

  4. C

Show answer & explanation

Answer: (B) B

Explanation

Total age = 20 × 10 + 25 × 12 = 200 + 300 = 500 years for 45 students. Average = 500/45 ≈ 11.11 years.