The average weight of 10 girls increases by 5 kg when a new girl comes in place of one of them weighing 50 kg. What might be the weight of the new girl?  Choose the correct choice from the following answers
A) 90 kg B) 100 kg C) 95 kg D) 85 kg E) 92 kg

Rationale: "total weight increased = 10 x 5 kg = 50 kg . weight of new person = 50 + 50 kg = 100 kg answer : b"
Answer: B