Daft Dave, our local DIY expert, is renovating the local hospital.
[Ref: ZRQK] © Kevin Stone
He has to number each of the rooms in the hospital with plastic numbers.
However, he has run out of the number 9.
How many 9's must Dave buy in order to number all 1,000 rooms?
Hint: Don't forget the extra 9's in 90, 91, etc.
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