Question: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 person `= 15` years `3` months `= 61/4` years. Total age of the 40 person `= (61/4) xx 4` years `= 610` years. `:.`Total age of 40 person `= (610 - 585)` Years `= 25` years.
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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.