2018 · Q45
The average of the ages of 15 students in a class is 19 years. When 5 new students are admitted to the class, the average age of the class becomes 18.5 years. What is the average age of the 5 newly admitted students?
Elementary MathematicsStatistics
- A17 years
- B17.5 years
- C18 years
- D18.5 years
Explanation
Total age of 15 students is 285; after admission the 20 students total 20 × 18.5 = 370. The 5 newcomers total 370 − 285 = 85, averaging 17 years, option (A).