The average weight of 4 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?  Select
A) 71 kg  B) 77 kg  C) 76.5 kg  D) data inadequate  E) none of these

Rationale: "total weight increases = 4 × 1.5 = 6 kg so the weight of new person = 65 + 6 = 71 kg answer a"
Answer: A