The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included,the mean rises by 400 grams. Find the weight of the teacher (in kg).

The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included,the mean rises by 400 grams. Find the weight of the teacher (in kg).
1). 55 kg
2). 57 kg
3). 66 kg
4). 56 kg

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