Question

The average of 30 student 9 years.if the teacher include it become 10year.what is teacher age

Answer 1

Answer:

Total of 30 students =30x9=270 yrs

Teachers age=x

Total including teacher =270 +x

Av=(270+x)/3 I=10

270+x=310

x=310-270=40yrs

T E A C H E R S age=40yrs