he average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 70 kg. What might be the weight of the new person ?  Pick.
A) 90 kg
B) 55 kg
C) 45 kg
D) 85 kg
E) 25 kg

Rationale: "explanation : total weight increased = ( 8 x 2.5 ) kg = 20 kg . weight of new person = ( 70 + 20 ) kg = 90 kg . answer : a"
Answer: A