The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is?
Solution
Average weight of class of 24 students = 35 kg
Total weight of students = 24 $$\times$$ 35 = 840 kg
When the weight of the teacher is added, the average becomes = 35.4
$$\therefore$$ Total weight of class = 25 $$\times$$ 35.4 = 885 kg
$$\therefore$$ Weight of teacher = 885 - 840 = 45 kg
Hence, option C is the correct choice
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