The average of 4 numbers is 39. When a new number is added, the average becomes 42. Find the new number.
- A. 46
- B. 54 ✓
- C. 44
- D. 58
Correct answer
B. 54
Explanation
Total of 4 numbers = 156. Total of 5 numbers = 210. New number = 210 - 156 = 54.
B. 54
Total of 4 numbers = 156. Total of 5 numbers = 210. New number = 210 - 156 = 54.