Civil Service Exam Reviewer · Averages · hard
The average of 7 numbers is 44. The average of the first 4 is 43, and the average of the last 4 is 43. What is the middle (4th) number?
- 44
- 43
- 40
- 36
Answer
D. 36
Solution
First 4 sum = 172; last 4 sum = 172. Together they count the middle number twice: 344 − 308 = 36.
More Averages questions
- The average age of 16 committee members increases by 1 year when a member aged 59 is replaced by a new member. How old is the new member?
- The average of 15 test scores was computed as 88. Later it was found that a score of 32 had been recorded as 33. What is the correct…
- The average of 4 consecutive even numbers is 29. What is the smallest of them?
- After 7 exams, Tess's average is 76. What score on the next exam would raise the average to exactly 77?
- The average of a, b and c is 61, and the average of a and b is 75. What is c?
- In a 10-item quiz, the scores and number of students were: 5 (9), 6 (6), 7 (5), 8 (1), 9 (5), 10 (9). What is the mean score?
- The average monthly salary of 18 employees is ₱30,000. When the manager's salary is included, the average rises by ₱500. What is the…
- The average of 7 consecutive odd numbers is 57. What is the largest of these numbers?
- A bus travels 80 km at 60 km/h, then 20 km at 50 km/h, then 20 km at 80 km/h. What is its average speed for the whole trip?
- The average age of 7 committee members increases by 1.5 years when a member aged 31 is replaced by a new member. How old is the new member?