Post-UTME Mathematics 2009 Objective — Question 12
Question 12 of 15 from the Post-UTME Screening (Post-UTME) Mathematics 2009 Objective paper, with the correct answer and a full explanation.
Advertisement
The mean age of a class of twenty students is 12. If their teacher's age is included, the mean becomes 13. The age of the teacher is
- A. 33Correct
- B. 39
- C. 28
- D. 25
Explanation
Sum of students' ages = 20x12=240. New sum with teacher = 21x13=273. Teacher's age = 273-240=33.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.