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  1. The average weight of 21 boys was recorded as 64kg. If the weight of the teacher was added, the average increased by one kg. What was the teacher's weight?
    1. 86kg
    2. 64kg
    3. 72 kg
    4. 98 kg
    5. None of the above
Correct Option: A

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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