The average weight of 8 persons increases by 1.5 kg. If a person weighing 65 kg is replaced by a new person, what could be the weight of the new person?  Options.
A) 76 kg B) 77 kg C) 76.5 kg D) data inadequate E) none of these

Rationale: "total weight increases = 8 × 1.5 = 12 kg so the weight of new person = 65 + 12 = 77 kg answer b"
Answer: B