Question

Average weight of 12 students and a teacher is 45 kg. If weight of the teacher is 66 kg, find average weight of 12 students?

Answer 1

total weight = 13×45= 585
585-66= 519
avg of 12 student = 519/12

Answer 2

The average weight of 12 students is 43.25kg.

Given :

Average weight of 12 students and a teacher = 45 kg.

weight of the teacher = 66 kg

To find :

average weight of 12 students

Solution :

Total weight of 12 students and the teacher = 45 x (12+1)

=45 x 13

=585 kg

Weight of 12 students except the teacher = (585-66)kg

= 519 kg

Therefore the average of weights of 12 students = total weight of 12 students / no. Of students

= 519 / 12

=43.25 kg

Hence, The average weight of 12 students is 43.25kg.

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