Question

2. 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?
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Answer 1

Answer:

47

Step-by-step explanation:

total age of students 35×11=385

total age of students and teacher 36×12=432

age of teacher =432-385=47

Answer 2

Answer:

Teacher's age be 47 years

Step-by-step explanation:

let the sum of ages of all 35 children be x

let the teacher's age be y

(1) average age of 35 children = 11 year

x / 35 = 11

x = 11 × 35 = 385

(2) when teacher's age is intended

x + y / 31 = 12

x + y = 12 × 36 = 472

on subtracting (1) from (2)

x + y - x = 432 - 385

y = 47

so teacher's age be 47