SOLUTION: The average <i>of a</i> set of n numbers is 23. When -35 is added to the set, the average is 21. How many numbers were in the original set??
Algebra.Com
Question 1129668: The average of a set of n numbers is 23. When -35 is added to the set, the average is 21. How many numbers were in the original set??
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If the average of a set of 
numbers is 23, then the sum of those numbers must be 
. If you add -35 to that sum and divide by 
you get the new average of 21, so:
Solve for
John
My calculator said it, I believe it, that settles it
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