Question
The average of 8 numbers is 21. When a new number is
added, the average becomes 23. Find the new number.Solution
Sum of 8 numbers = 8 × 21 = 168 Let new number be x. Now there are 9 numbers with average 23: (168 + x)/9 = 23 168 + x = 23 × 9 = 207 x = 207 − 168 = 39 Answer: The new number is 39.
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