The number 3

Ski organizers should print the start numbers from 1 to 45. How many times will they use the number 3 when printing?

Correct result:

x =  15

Solution:

x=5+10=15 3...1 13...1 23...1 30...1 31...1 32...1 33...2 34...1 35...1 36...1 37...1 38...1 39...1 43...1x=5 + 10=15 \ \\ 3 ... 1 \ \\ 13 ... 1 \ \\ 23 ... 1 \ \\ 30 ... 1 \ \\ 31 ... 1 \ \\ 32 ... 1 \ \\ 33 ... 2 \ \\ 34 ... 1 \ \\ 35 ... 1 \ \\ 36 ... 1 \ \\ 37 ... 1 \ \\ 38 ... 1 \ \\ 39 ... 1 \ \\ 43 ... 1

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