The average of five numbers is 38. If one number is removed, then the average becomes 30. What is the removed number?
Show answer & explanation
Correct answer: C
Explanation
Average of 5 numbers = 38
Average of 4 numbers after removing one number = 30
Sum of the 5 numbers = 38 × 5 = 190
Sum of the 4 numbers = 30 × 4 = 120
Removed number = 190 − 120 = 70