The average of 10 numbers is 65. When a new number is added, the average becomes 67. Find the new number.
- A. 79
- B. 73
- C. 87 ✓
- D. 103
Correct answer
C. 87
Explanation
Total of 10 numbers = 650. Total of 11 numbers = 737. New number = 737 - 650 = 87.
C. 87
Total of 10 numbers = 650. Total of 11 numbers = 737. New number = 737 - 650 = 87.