Average weight of 30 students of a class is 40 kg. If the weight of a teacher be included, the average increases by 1 kg. What is the weight of the teacher?
Q1. Average weight of 30 students of a class is 40 kg. If the weight of a teacher be included, the average increases by 1 kg. What is the weight of the teacher?
Answer: 71kg
Explanation: New total = 31 students with average 41 kg; teacher's weight = 31 × 41 − 30 × 40 = 1271 − 1200 = 71 kg.