The average weight of 4 person's increases by 3 kg when a new person comes in place of one of them weighing 70 kg. What might be the weight of the new person?
Select.
A) 75 kg B) 82 kg C) 86 kg D) data inadequate E) none of these

Rationale: "total weight increased = ( 4 x 3 ) kg = 12 kg . weight of new person = ( 70 + 12 ) kg = 82 kg . answer : option b"
Answer: B