The average of 9 numbers is 63. When one number is removed, the average becomes 60. What number was removed?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 87.
Sum of 9 numbers = 63 × 9 = 567
After removing one, the sum of 8 numbers = 60 × 8 = 480
Removed number = 567 – 480 = 87