Question

The average age of a class of 40 students was 21/2 years.
When the teacher was also included the average age of the
class became 22 years. What was the teacher's age?

Answer 1

Answer:

the teacher age was 44 years

Step-by-step explanation:

40 students age = 21/2

after including teacher age class became = 22

22×2=44

thus, teacher age is 44

Answer 2

Step-by-step explanation:

write the question clearly and correctly get answer immediately

if average = 21 years

The average age of a class of 40 students was 21 years.

sum of age of 40 students/40= 21

sum of 40 age of students= 40×21= 840----> 1

the teacher was also included the average age of the

class became 22 years

sum of 40students and teacher age/41=22

sum of 40students and teacher age= 22×41= 902--->2

2 - 1

age of teacher = 902 - 840 = 62