The average of 4 numbers is 55. When a new number is added, the average becomes 58. Find the new number.
- A. 70 ✓
- B. 62
- C. 57
- D. 76
Correct answer
A. 70
Explanation
Total of 4 numbers = 220. Total of 5 numbers = 290. New number = 290 - 220 = 70.
A. 70
Total of 4 numbers = 220. Total of 5 numbers = 290. New number = 290 - 220 = 70.