The average of 20 students is 12 years, if the teacher’s age is included, average increases by one. The age of the teacher is: A. 30 years B. 33 years C. 28 years D. 35 years

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Answer-B
Solution-

Solution(By Apex Team)


Average of 20 students = 12 years Total age of 20 students = 20 × 12 = 240 years When teacher included average become 13 years Now, total age 20 students and teacher = 13 × 21 = 273 years ∴ Age of teacher = 273 – 240 = 33 years

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