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:

the average age of students =x/35is 11

x=35×11=385

the average age of student and teacher =x/36=12

x=36×12

=432

the age of teacher= 432 - 385 =47

Answer 2

$\: \: \: \: \: \: \: \: \: \: \: \: \huge\mathfrak{\ gud \: morning}$

Total strength of the class = 35

The average age of child = 11 .( excluding teacher)

Therefore, the total age of the students = 35 × 11

= 385 .( equation 1)

Total strength of the class = 36

The average age of child = 12 .( including teacher)

Therefore, the total age of the students including teacher = 12 × 36

= 432 .(equation 2)

$\mathfrak{According \: to \: question}$

Age of the teacher = equation 2 - equation 1

= 432-385

$= \bold{\boxed{\blue{\large{47\:km}}}}$

$\huge\mathfrak{not \: surely \: i \: am \: an \: army \: but \: i \: am \: a \: big }$

$\huge\mathfrak{fan \: of \: b.t.s}$