SOLUTION: In a building all office doors were numbered, using plates containing one digit each (for example, when numbering office number 14 two plates were used, one with the number 1 and t

Question 1093255: In a building all office doors were numbered, using plates containing one digit each (for example, when numbering office number 14 two plates were used, one with the number 1 and the other with the number 4. If in total 35 plates were used, how many doors are there?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Doors 1 through 9 use
plates
Doors 10 through 19 use
plates
Doors 20 through 22 use
plates
----------------------------------
Total plates used is
The total number of doors is

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