The average of 8 numbers is 15. When a new number is added, the average becomes 17. Find the new number.
- A. 40
- B. 29
- C. 33 ✓
- D. 30
Correct answer
C. 33
Explanation
Total of 8 numbers = 120. Total of 9 numbers = 153. New number = 153 - 120 = 33.
C. 33
Total of 8 numbers = 120. Total of 9 numbers = 153. New number = 153 - 120 = 33.