The average age of a class of 29 students is 20 years. if the age of teacher is included, then the average increases by 3 months. find the age of the teacher.
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Average of 20 students = 12 yearsTotal age of 20 students= 20 × 12= 240 yearsWhen teacher included average become 13 yearsNow, total age 20 students and teacher= 13 × 21 = 273 years∴ Age of teacher= 273 - 240
Average of 20 students = 12 yearsTotal age of 20 students= 20 × 12= 240 yearsWhen teacher included average become 13 yearsNow, total age 20 students and teacher= 13 × 21 = 273 years∴ Age of teacher= 273 - 240= 33 years
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