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?
$pls \: explain \: this \: question$
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Answer 1

Step-by-step explanation:

average = age/number of persons

1st case-

average = age of students/ no of students

11 = x/35

x1= 35*11= 385

2nd case

average = number of ages / number of people

12=x/36

x2=36*12=432

age of the teacher = x2-x1=432-385 = 47

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Answer 2

$\huge\bold\red{❥︎Aɴsᴡᴇʀ}$

Total age of children

$35 \times 11 = 385$

Total age including teacher

$36 \times 12 = 432$

Teachers age =

$432 - 385 = 47$

Hence, age of teacher = 47