The average of 5 numbers is 20. If one number is excluded, the average becomes 18. Find the excluded number.
- A. 28 ✓
- B. 24
- C. 20
- D. 30
Correct answer
A. 28
Explanation
Sum of 5 = 100, sum of 4 = 72, excluded number = 100-72 = 28.
A. 28
Sum of 5 = 100, sum of 4 = 72, excluded number = 100-72 = 28.