The average weight of a group of $20$ students is $54\text{ kg}$. If the weight of the teacher is included, the average weight increases by $1\text{ kg}$. What is the weight of the teacher?
Options:
- A: $68\text{ kg}$
- B: $72\text{ kg}$
- C: $75\text{ kg}$
- D: $80\text{ kg}$
Related Practice Questions:
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