The average of five numbers is 20. If one number is excluded, the average of the
Practice Questions
Q1
The average of five numbers is 20. If one number is excluded, the average of the remaining numbers becomes 18. What is the excluded number?
22
24
20
18
Questions & Step-by-Step Solutions
The average of five numbers is 20. If one number is excluded, the average of the remaining numbers becomes 18. What is the excluded number?
Step 1: Calculate the total of the five numbers using the average. Since the average is 20 and there are 5 numbers, multiply 20 by 5. This gives you 100.
Step 2: Calculate the total of the remaining four numbers after excluding one number. The average of these four numbers is 18, so multiply 18 by 4. This gives you 72.
Step 3: To find the excluded number, subtract the total of the remaining four numbers (72) from the total of the five numbers (100). So, 100 - 72 equals 28.
