The average weight of 10 students decreases by 6 kg when one of them weighing 120 kg is replaced by a new student. The weight of the student is	Pick
A) 62 kg  B) 60 kg  C) 70 kg  D) 72 kg  E) none of these

Rationale: "explanation : let the weight of student be x kg . given , difference in average weight = 6 kg = > ( 120 - x ) / 10 = 6 = > x = 60 answer : b"
Answer: B