The average weight of 8 students decreases by 5 kg when one of them weighing 86 kg is replaced by a new student. The weight of the student is	Select:
A) 46 kg	B) 48 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 = 5 kg = > ( 86 - x ) / 8 = 5 = > x = 46 answer : a"
Answer: A