The average weight of 21 boys was recorded as 64 kg…

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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 1 kg. What was the teacher’s weight?

  1. A. 86 kg
  2. B. 64 kg
  3. C. 72 kg
  4. D. 84 kg

Answer: Option A

Here is complete explanation of The average weight of 21 boys was recorded as 64 kg….

Solution(By ExamCraze Team)

Average weights of 21 boys = 64 kg
Total weights of 21 boys
= 64 × 21
= 1344 kg
The weight of the teacher was added then average increase by 1 kg
⇒ Total weight of teacher and 21 boys
= 65 × 22
= 1430 kg
∴ Weight of teacher
= 1430 - 1344
= 86 kg

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