Question 111

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

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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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