1.

The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by 3 months. Find the age of the teacher.

Answer»

Total age of 39 persons = (39 x 15) years = 585 years. 

Average age of 40 persons= 15 yrs 3 months = 61/4 years. 

Total age of 40 persons = ((61/4 )x 40) years= 610 years. 

 Age of the teacher = (610 - 585) years=25 years.



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