The average weight of 2 person's increases by 4.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
Choose the most appropriate option:
A) 74 kg B) 76.5 kg C) 85 kg D) 78 E) none of these

Rationale: "explanation : total weight increased = ( 2 x 4.5 ) kg = 9 kg . weight of new person = ( 65 + 9 ) kg = 74 kg . answer : a"
Answer: A