The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by3 months. Find the age of the teacher.
Options:
A . 24years
B . 25years
C . 22years
D . 21years
Answer: Option B
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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