Question

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 :

Answer 1

The weight of the teacher is 45 kg.

Explanation :

The average weight of the class of 24 students = 35

=> (∑w)/24 = 35

=>∑w = 35 x 24 = 840

That is the sum of weight of all the students is 840 kg

Let the teachers weight is x kg. after adding the weight of the teacher the weight of the whole class will become (840 + x)

The number of person = 24 + 1 = 25

New average = 35.4 kg

Hence putting these values we get,

(840 + x)/25 = 35.4

=> 840 + x = 25 x 35.4 = 885

=> x = 885 - 840 = 45 kg

Hence the weight of the teacher is 45 kg.

Answer 2

Answer:

24 ×35 = 840

the one teacher arises = 24 + 1 = 25

weight = 35kg×40g= 35.4

weight = 35.4 × 25= 885

weight of teacher = 885 - 840 = 45 kg

Explanation:

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