Question

The average weight of 22 students in a group is 90kg. When
teacher's weight is included, the average decreases by 2.
What is the teacher's weight​

Answer 1

Answer:

total weight of 22 students is 90×22kg=1980kg

when teacher weight is included then the average weight is decreases by 2.then the total weight of 23 person is 23×88kg=2024kg

so the teacher's weight is (2024-1980)kg=44kg