54. The Average age of a class of 22 subjects in 21 years. The average increased by 1 when the teacher’s age also included. What is the age of the teacher?
[A] 44
[B] 41
[C] 43
[D] 40
Answer : A
Explanation :
|
|
|
|
|
|
21 years x 22 nos = 462 years
|
... (1)
|
|
|
|
22 years x 23 nos = 506 years
|
... (2)
|
|
|
|
|
Teacher’s age = (2) - (1) = 506 – 462 = 44 Years.
|
|
