Question

The average age
of a child in a class of 35
is 11. The average age including the teacher is 12.
How old is the teacher?​

Answer 1

Answer:

47

Step-by-step explanation:

let total ages of all students be x  

11 = ×/35 (average=total/no.)  

× = 11×35  

×=385  

now,  

12=y/36(let y=x+teacher's age)  

y=36×12  

y=432  

teacher's age = 432-385  

= 47

Answer 2

Answer:

the age of the teacher is 47