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  Choices.
A) 45 kg B) 50 kg C) 53 kg D) 55 kg E) NOne
Sol.   Weight of the teacher   = (35.4 × 25 – 35 × 24)kg   = 45 kg.   45 kgnswer 45 kg
<result>A</result>
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