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…1

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