Question

The average age of a class of 22 students in 21 years. the average increases by 1 when the teacher's age also included. what is the age of the teacher

Answer 1

Total Age of Students = 22*21 = 462
take x as teachers age
$\frac{462 + x}{23} = 22$
23 because new sum of people is 23
22 is the new average
462 + x = 506
x = 506-462
x = 44