Reading the question very carefully, I'd have to say "none". If the stack consists of "900 dollar bills",
then there are no "50 dollar bills" in it.
But the questioner is probably referring to equivalent values.
900 dollar bills have a face value of $900.00 . In order to match that same face value with $50.00 bills,
you need 18 of them.
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There are 5000 dollar bills.
5000 bills
You would get 10 five dollar bills.
10
10