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The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by one kg. What was the teacher's weight?

  • a)
    82 kg                                   

  • b)
    85 kg

  • c)
    86 kg                        

  • d)
    90 kg

  • e)
    None of these

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The average weight of 21 boys was recorded as 64 kg. If the weight of ...
Here, n = 21, a = 64, b = 65 
Weight of teacher = n (b - a) + b 
= 21 (65 - 64) + 65 = 21 + 65 = 86 kg
So, the correct option is 'C'
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Most Upvoted Answer
The average weight of 21 boys was recorded as 64 kg. If the weight of ...
Here, n = 21, a = 64, b = 65 
Weight of teacher = n (b - a) + b 
= 21 (65 - 64) + 65 = 21 + 65 = 86 kg
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Community Answer
The average weight of 21 boys was recorded as 64 kg. If the weight of ...
Average weight of 16 girls is 54 thn total weight of 16 girls are = 16×54 =864 if teacher weight is added thn average weight of 16 girls increased by 2 the average of 16 girls + 1 teacher = 54 + 2 total of 17 peaople = 56 × 17 =952 then difference between total of of 16 girls+ 1teacher - 16girls = 952- 864 = 88 ans...
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