The average of 4 numbers is 55. When a new number is added, the average becomes 56. Find the new number.
- A. 69
- B. 56
- C. 60 ✓
- D. 72
Correct answer
C. 60
Explanation
Total of 4 numbers = 220. Total of 5 numbers = 280. New number = 280 - 220 = 60.
C. 60
Total of 4 numbers = 220. Total of 5 numbers = 280. New number = 280 - 220 = 60.