The average of nine numbers is 20. If two of these numbers are removed, then the average becomes 18. What is the sum of the two numbers that are removed?
Answer & explanation
Correct answer: option 3
Sum of 9 numbers = 9 × 20 = 180
Sum of 7 numbers = 7 × 18 = 126
Sum of two numbers that are removed = 180 - 126 = 54