Averages in Aptitude MCQ Quiz (Multiple Choice Questions And Answers)
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7. The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?
- 9
- 18
- 27
- 45
8. The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers?
- 5
- 10
- 15
- 20
9. The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?
- 9
- 18
- 27
- 45