The tens digit is three times the thousands digit.

The tens digit could be either 3, 6, or 9.

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what is the sum of my digits is 13?

To find the solution to this problem, we need to break it down step by step.

Step 1: Let's assume the thousands digit is "x."
Step 2: We know that the tens digit is three times the thousands digit. So, the tens digit would be 3x.
Step 3: Finally, the hundreds digit can be any number since it is not specified in the question.

So, the three-digit number can be represented as: (x) (3x) (y), where x is the thousands digit, 3x is the tens digit, and y is the hundreds digit.

For example, if the thousands digit is 2, then the tens digit would be 3 times 2, which is 6. The number could be 263, where 2 is the thousands digit, 6 is the tens digit, and 3 is a placeholder for the hundreds digit.

Please note that the hundreds digit can be any number.