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

Step-by-step explanation:

let total ages of all students be x

11 = ×/35 (everage=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

follow me and say thanks for such efforts