It is 50.
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The total of all of the numbers from 1 to 99 is 4950.
All of the whole numbers from 10 to 99.
None.
The average of nine numbers is 99, that is tha the sum of those numbers was 99 x 9, which is 891. The average of 8 numbers is 89, that is that the sum of those numbers was 89 x 8, which is 712. So, 891 - 712 = 179 The number that was deleted was 179.
999-99=900