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 answer:

x =  15

Step-by-step explanation:

$$\begin{gathered} x=5+10=15 \\ 3\dots 1 \\ 13\dots 1 \\ 23\dots 1 \\ 30\dots 1 \\ 31\dots 1 \\ 32\dots 1 \\ 33\dots 2 \\ 34\dots 1 \\ 35\dots 1 \\ 36\dots 1 \\ 37\dots 1 \\ 38\dots 1 \\ 39\dots 1 \\ 43\dots 1 \end{gathered}$$

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