The average age of 25 students and teacher is 15 years. If the age of the teacher is excluded, then the average is decreased by one year. Find the age of the teacher?
A40
B60
C45
D56
Answer:
A. 40
Read Explanation:
Total age of 25 students and teacher = 26*15
= 390
Total age of 25 students = 25*14 = 350
The age of the teacher = 390 – 350 = 40