SOLUTION: the average of six numbers is 19.when one of those numbers is taken away ,the average of the remaining five numbers is 21.what numbers was taken away ? I know the answer is 9 but

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Question 833181: the average of six numbers is 19.when one of those numbers is taken away ,the average of the remaining five numbers is 21.what numbers was taken away ?
I know the answer is 9 but I wanted explain please

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
6*19-5*21=x
114-105=x
9=x