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 :
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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.
Answered by
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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