Question

the average weight of 20 students of a class is 45 kg and that of rest of the 30 students is 40 kg . what is the average weight of the class?​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Start with the things you know:

Initial number of people = N0 = 35

Initial average weight of students = A0 = 40kg

Final number of people = N1 = 35 + 1 (teacher) = 36

Final average weight of people = A1 = 40.5kg

The average weight = total weight / number of people

Then derive the things you need to know:

So the initial total weight would be N0*A0 = 35*40kg = 1400kg

And the final total weight would be N1*A1 = 36*40.5kg = 1458kg

So adding the teacher made the total weight increase by 58kg.