The average weight of a group of 24 students increases by 2 kg when the weight of teacher is also included. If the initial average weight of the group of 24 students was 30 kg, then what is the weight of teacher?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 80 kg
Average = Sum of weight of all members/Total members
Sum of weight of 24 students = 24 × 30 = 720
If weight of teacher is included then Average becomes 32
Sum of weight of 24 students + Weight of Teacher = 32 × 25 = 800
Weight of Teacher = 800 - 720 = 80 Kg