Based on the fact that when the three-digit counting number is reversed, the difference between the two numbers has a tens digit of 9, the number is 936.
When the number 936 is reversed, and the first number goes to the back and the back comes to the front, the number becomes 639.
The difference between these numbers is:
= 936 - 639
= 297
The tens digit here is 9.
Find out more on reversing numbers at https://brainly.com/question/27537576
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