The average weight of 21 boys is 68 kg.If teacher's weight is included the average weight is
increased by 1 kg. What is teacher's weight
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Answer:
student's total weight=(21×68)
=1428kg
now by adding teacher's weight the total weight is ,
=(22×69)kg
=1518kg
so the teacher's weight is
=(1518-1428)kg
=90kg
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