Question : The average weight of 25 students in a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is:
Option 1: 76 kg
Option 2: 77 kg
Option 3: 74 kg
Option 4: 75 kg
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Correct Answer: 76 kg
Solution : The weight of all the 25 students in the class = 25 x 50 = 1250 kg When the weight of the teacher is included, the average weight increases by 1 kg. The weight of 25 students + weight of the teacher = 26 x 51 = 1326 kg Weight of the teacher = (1326 – 1250) = 76 kg Hence, the correct answer is 76 kg.
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