The average weight of a class of 21 students is 36kgs. When the weight of the teacher is also included, the average weight increases by 1kg. Find out the weight of the teacher ???
Answers
Answer:
Weight of the teacher is 58 kg.
Explanation:
Given,
Average weight of the class : 36 kg
Number of students in a class : 21
We know,
Average = ( sum of quantities ) / ( number of quantities )
Here,
= > Average = ( sum of weights of 21 students ) / 21
= > 36 kg = ( sum of weights of 21 students ) / 21
= > 36 x 21 kg = sum of weight of 21 students
= > 756 kg = sum of weight of 21 students
When weight of teacher is also included : Average weight is increased by 1 kg, so that is 36 kg + 1 kg now. And the number of quantities is 21 + 1 now.
Thus,
= > New average = ( sum of weight of 21 students + weight of teacher ) / ( 21 + 1 )
= > 37 kg = ( 756 kg + weight of teacher ) / 22
= > 37 kg x 22 = 756 kg + weight of teacher
= > 814 kg = 756 kg + weight of teacher
= > 814 kg - 756 kg = weight of teacher
= > 58 kg = weight of teacher
Hence the weight of the teacher is 58 kg.
Answer:
it's actually 60 Kgs ___________