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In a class average age of 24 boys and their teachers is 15 years. When the teacher's age is excluded the average age decreases by one year. The age of teacher is?
  • a)
     40
  • b)
    39            
  • c)
    38          
  • d)
    41
Correct answer is 'B'. Can you explain this answer?
Verified Answer
In a class average age of 24 boys and their teachers is 15 years. When...
The total age of 24 boys & teacher is = 25 x 15 = 375 years

Let the teacher's age = x year

According to the question, 

25 x 15 = 24 + 14 + x

375 = 336 + x 

=> x = 39 years
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Most Upvoted Answer
In a class average age of 24 boys and their teachers is 15 years. When...
Average age of 24 student including teacher - 15 years Average age of 23 student excluding teacher - 14 years 24×15= 360 23×14= 322 360-322 = 38 year + 1 year current age that decreased in question thats why total age is 39 years.
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Community Answer
In a class average age of 24 boys and their teachers is 15 years. When...
39
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In a class average age of 24 boys and their teachers is 15 years. When the teacher's age is excluded the average age decreases by one year. The age of teacher is?a)40b)39c)38d)41Correct answer is 'B'. Can you explain this answer?
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