First number is 20 and last is 99
so 20 = 1 then 21 = 2 then 29 = 10
So from 29 take 19 to make 10
then apply to 99 as in 99 - 19 = answer 80
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I believe here are 51 such numbers.
176
90. all the numbers from 10 through 99
-99
-99