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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?

A. 86 kg B. 64 kg C. 72 kg D. 84 kg Answer: Option A
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Solution(By Apex 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 × 21 = 1430 kg ∴ Weight of teacher = 1430 – 1344 = 86 kg

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