The average weight of a group of 22 students increases by 1 kg when the weight of the teacher is also included. If the initial average weight of the group of 22 students was 31 kg, then what is the weight of the teacher?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 54 kg
Average = Sum of all terms/Total terms
Sum of weight of 22 students = 22 × 31 = 682
Sum of weight of 22 students + teacher = 32 × 23 = 736
Age of teacher = 736 - 682 = 54 kg.