The average age of 24 boys and a teacher is 15. When the teacher's age is excluded, the average decreases by 1. What is the age of the teacher?

Answer: 39 years
Explanation
  • Total age of 24 boys and one teacher = 25 × 15 = 375 years
  • Average age of 24 boys = 15 − 1 = 14 years
  • Total age of 24 boys = 24 × 14 = 336 years
  • Teacher's age = 375 − 336 = 39 years
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