The average weight of nine persons is 25 kg. If a new person joins this group, then the average weight becomes 26 kg. What is the weight of the new person?
The average weight of nine persons is 25 kg.
total weight of nine persons = $$25\times9$$ = 225 kg  Eq.(i)
If a new person joins this group, then the average weight becomes 26 kg.
total weight of the group when a new person joins = $$26\times10$$ = 260 kg   Eq.(ii)
Weight of the new person =Â Eq.(ii)-Eq.(i)
=Â (260-225) kg
= 35Â kg
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