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?

56 58 54 52

54

Sum of 9 numbers = 9 × 20 = 180 Sum of 7 numbers = 7 × 18 = 126 Sum of two numbers that are removed = 180 - 126 = 54