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Railways PYQCBT 1 2016

RRB NTPC · Question 69

The average weight of 30 students in a class is 25 kgs. If the weight of the class teacher is added, the average weight increase by 2 kgs. The weight of the class teacher (in kgs) is: A. 86 B. 84 C. 81 D. 87

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (C) D

Explanation

30 students weigh 30 × 25 = 750 kg in all. With the teacher the average is 27 kg for 31 people: 31 × 27 = 837 kg. The teacher weighs 837 − 750 = 87 kg.