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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?
  1. 39 years
  2. 41 years
  3. 40 years
  4. 38 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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