The average weight of 21 girls was recorded as 64 kg. If the weight of the Maths teacher was added, the average increased by two kg. What was the teacher’s weight?
(a) 86 kg
(b) 92 kg
(c) 98 kg
(d) 108 kg
(e) 114 kg
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Your answer is : d)
Solution:
when, people=21, average weight= 64
Therefore, total weight of 21 people= 1344
Let the teacher be 22nd person
When, people = 22, average weight= 64+2= 66
Therefore, total weight of 22 people= 1452
and, weight of the 22nd person=1452-1344
= 108
Please, mark me as the brainliest
Solution:
when, people=21, average weight= 64
Therefore, total weight of 21 people= 1344
Let the teacher be 22nd person
When, people = 22, average weight= 64+2= 66
Therefore, total weight of 22 people= 1452
and, weight of the 22nd person=1452-1344
= 108
Please, mark me as the brainliest
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