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# The average age of 30 students is 9 years. If age of their teacher is included, it becomes 10 years. The age of teacher (in years) is

 A) 27 years B) 31 years C) 35 years D) 40 years

 D) 40 years

Age of teacher is (31 X 10 - 30 X 9) = 40 Years

Part of solved Average questions and answers : >> Aptitude >> Average

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