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Average age of class of 39 student is 15 years. If the age of teacher is included the average is increased by 3 months. Find the age of the teacher?

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Total age of students=

X/39 = 15*12 = 7020 (in months)

 

Toatal age of students & teacher=

X/40 = (15*12)+3= 7320 (months)

 

teacher's age = 7320-7020= 300(month)= 25 year

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