The average age of 24 students and their teacher is 15 years. If the teacher’s age is excluded, the average age decreases by 1 year. What is the teacher’s age?
A38 years
B39 years
C40 years
D41 years
Explanation
Total age of 25 people = 25 * 15 = 375 years. Total age of 24 students = 24 * 14 = 336 years. Teacher’s age = 375 – 336 = 39 years.
Exam Relevance
- Topic: Averages
- Subtopic: Exclusion Problems
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