The average weight of 6 students decreases by 3 kg when one of them weighing 80 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 = 3 kg = > ( 80 - x ) / 6 = 3 = > x = 62 answer : a"
Answer: A