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 The 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 40 person = `(61/4 xx 40)` years =610 years. `:.` Age of the teacher= (610 x 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?