The average weight of 10 persons increases by 4.2 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 correct choice from the following answers:
A) 107 kg  B) 80 kg  C) 120 kg  D) 90 kg  E) 100

Rationale: "solution total weight increased = ( 10 x 4.2 ) kg = 42 kg . weight of new person = ( 65 + 42 ) kg = 107 kg . answer a"
Answer: A