..:: Average on Arithmetic Aptitude related Questions and Answers

Average on Arithmetic Aptitude related Questions and Answers

Question : The average of 20 students is 12 years, if the teacher's age included, average increases by one. The age of the teacher is:
1. 43 yrs
2. 33 yrs
3. 35 yrs
4. 37 yrs
Answer : 2 - 33 yrs

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.
TeamOne Monday, 01 October 2018