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The average age of 25 students in a group is 14 years. When the teacher's age is included, the average increases by 1.5 years. What is the teacher's a
Question

The average age of 25 students in a group is 14 years. When the teacher's age is included, the average increases by 1.5 years. What is the teacher's age (in years)?

A.

42

B.

50

C.

53

D.

46

Correct option is C

Sum of age of 25 students = 25× 14 = 350 years 

Sum of age of 25 students and teacher = 26× 15.5 = 403 years 

Age of teacher = 403-350= 53 years 

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