Question

rhe mean age of 30 student is 9yr if the age of their teacher is included then mean becomes 10yr the age of teacher is ?​

Answer 1

total age of 30 students is=9*30=270yrs

total age of 31 students is=10*31=310yrs

so ur answer is 310-270=40yrs

plz mark brainliest

Answer 2

Answer:

Step-by-step explanation:

40 year

Answer 3

Answer:

Step-by-step explanation:

40 year