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?
Answers
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
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)
Age of the teacher = equation 2 - equation 1
= 432-385