The average of 5 numbers is 20. If one number is excluded, the average becomes 18. What is the excluded number?
Q1. The average of 5 numbers is 20. If one number is excluded, the average becomes 18. What is the excluded number?
Answer: 28
Explanation: Sum of 5 numbers = 5 * 20 = 100. Sum of 4 numbers = 4 * 18 = 72. Excluded number = 100 - 72 = 28.