Sum of Digits vs. Reversed Integer

Let $$n$$ be a positive integer. Define a new integer $$m$$ as follows:

$$m = 3n + 7$$

Given this definition, consider the following two quantities:

Quantity A: The sum of the digits of $$m$$ when written in decimal notation.

Quantity B: The integer obtained by reversing the digits of $$n$$.

What can we conclude about the relationship between Quantity A and Quantity B?