The average weight of a class of 30 students is 50 kg. If the weight of the teacher is included, the average weight increases by 500 gm. The weight of the teacher is

The average weight of a class of 30 students is 50 kg. If the weight of the teacher is included, the average weight increases by 500 gm. The weight of the teacher is 

• A. 50.5 kg
• B. 65.5 kg
• C. 62.5 kg
• D. 60.5 kg

 

The correct answer is option B. 65.5 kg. Can you explain this answer in the comments?

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