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20 9's unless this is a trick and I'll say 1 9 but I'll go with 20

19

Wrong

Haha dont need to say it twice 😂

9 , 19 , 29 , 39 , 49 , 59 , 69 , 79 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99.

The answer is 19...that is if I understood your question clearly

Your answer 19 is wrong.
It is funny that in fact you listed them 20 all here.

19 of course

There are 20 9s between 0-100 This includes:
The numbers ending in 9 are: 9, 19, 29, 39, 49, 59, 69, 79, 89, 99.
That's 10
And numbers starting with 9 that is: 90, 91, 92, 93, 94, 95, 96, 97, 98, 99.
Also 10