The average of 14 girls and their teacher is 15. If the teacher's age is excluded, then the average is reduced by 14. What is the teacher's age
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The average age of 15 persons is 15 years, means their total age is 15x15 = 225 years. The average age of 14 girls is 15–1= 14 years. So the total age of the 14 girls is 14x14 = 196 years. Therefore the teacher is 225=196 = 29 years old.
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