The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is :
Choose one.
A) 45	B) 46	C) 47	D) 48	E) 49

Rationale: weight of the teacher = ( 35.4 x 25 - 35 x 24 ) kg = 45 kg . answer : a
Answer: A