Average of 7 numbers is 28. One of these numbers is 22. 22 is replaced with a new number. New average becomes 30. What is that new number?
Show answer & explanation
Correct answer: B
Explanation
Given:
Number of numbers = 7
Old average = 28
New average = 30
One number = 22
According to the formula:
Sum = Average × Number
Old sum = 28 × 7 = 196
New sum = 30 × 7 = 210
Difference = 210 − 196 = 14
New number = 22 + 14 = 36