1. The average weight of 21 boys was recorded as 64kg. If the weight of the teacher is added, the average increased by one kg. What was the teacher’s weight?
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By: anil on 05 May 2019 01.18 am
The average weight of 21 boys is 64 Kgs. The average weight of 21 boys and the teacher is 65 Kgs. So, total weight of 21 boys is 21*64 = 1344 The weight of 21 boys and the teacher = 22*65 = 1430 Hence, the weight of the teacher is 1430 - 1344 = 86 Kgs
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