Question

The average age of a class of 29 students is 20 years. if the age of teacher is included, then the average increases by 3 months. find the age of the teacher.​

Answer 1

$\huge\underbrace\mathrm\purple{Answer}$

lets assume that avg, of 29 students is x/29=18

then x is 29x18=522

let age of teacher be y.

then, 522+y/30=18.2

y=546–522=24

therefore age of teacher is 24