Question

The average weight of 20 students in a class is 50 kg. If the weight of the teacher is included, the average weight increases by 1 kg. If the weight of the teacher is excluded and replaced with another student weighing 55 kg, what will be the new average weight of the group?

A 50.24 kg
B 51.67 kg
C 52.33 kg
D 53.15 kg
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