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The mean weight of 25 students in a class is 50 kg. When the class teacher's weight is added, the average climbs by 1 kg. What does the teacher weigh?

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

Correct answer: 76 kg

Solution

Old total = 25 x 50 = 1250 kg. New total = 26 x 51 = 1326 kg. The teacher's weight = 1326 - 1250 = 76 kg.

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