JAMB Mathematics 2018 Objective — Question 2
Question 2 of 39 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
Advertisement
The average age of three children in a family is 9 years. If the average age of their parents is 39 years, the average age of the whole family is
- A. 20 years
- B. 21 yearsCorrect
- C. 24 years
- D. 27 years
Explanation
Total age of children = 3×9=27. Total age of parents = 2×39=78. Total=105, family size=5. Average = 105/5 = 21 years.
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.