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The average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included, the average increases by 1 kg. The weight of the teacher is:

1. 74 kg
2. 75 kg
3. 76 kg
4. 77 kg

Correct answer: 76 kg

Solution

Total weight of 25 students = 25 × 50 = 1250 kg. With the teacher included, average becomes 51 kg for 26 people, so new total = 26 × 51 = 1326 kg. Therefore, teacher’s weight = 1326 − 1250 = 76 kg.

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