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Average is 140 for 9 numbers
Then total is
9 x 140
And one number is 180
Then the the remaining is 9 x 140 - 180
And average of eight is
(9 x 140 -180) /8
Then total is
9 x 140
And one number is 180
Then the the remaining is 9 x 140 - 180
And average of eight is
(9 x 140 -180) /8
thanks