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:

x=5+10=15 31 131 231 301 311 321 332 341 351 361 371 381 391 431

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You need to know the following knowledge to solve this word math problem:

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