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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) 86 kg

B) 64 kg

C) 72 kg

D) 98 kg

Correct Answer:
A) 86 kg

Description for Correct answer:
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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