SOLUTION: The average of ten is 15. If one number is removed, the average becomes 14. What number is removed? Please use one variable only

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Question 823402: The average of ten is 15. If one number is removed, the average becomes 14. What number is removed? Please use one variable only
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
The average of ten is 15.

AVERAGE = 

    15 = 

Multiply both sides by 10

    150 = SUM

If one number is removed, the average becomes 14. What number is removed?
Let the number removed be x

Then the sum of the remaining 9 numbers = 150-x

AVERAGE = 

     14 = 

Multiply both sides by 9

    126 = 150-x

      x = 24

The number removed was 24

Edwin
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