The base-$7$ representation of number $n$ is $\overline{abc}_{(7)}$, and the base-$9$ representation of number $n$ is $\overline{cba}_{(9)}$. What is the decimal (base-$10$) representation of $n$?
1. Let's denote the number \( n \) in base-7 as \( \overline{abc}_{(7)} \). This means:
   \[
   n = 49a + 7b + c
   \]
   where \( a, b, \) and \( c \) are digits in base-7, i.e., \( 0 \leq a, b, c \leq 6 \).

2. Similarly, the number \( n \) in base-9 is \( \overline{cba}_{(9)} \). This means:
   \[
   n = 81c + 9b + a
   \]
   where \( a, b, \) and \( c \) are digits in base-9, i.e., \( 0 \leq a, b, c \leq 8 \).

3. Since both expressions represent the same number \( n \), we can set them equal to each other:
   \[
   49a + 7b + c = 81c + 9b + a
   \]

4. Rearrange the equation to group like terms:
   \[
   49a + 7b + c - 81c - 9b - a = 0
   \]
   \[
   48a - 2b - 80c = 0
   \]

5. Simplify the equation by dividing through by 2:
   \[
   24a - b - 40c = 0
   \]
   \[
   b = 24a - 40c
   \]

6. Since \( a, b, \) and \( c \) are digits, we need to find values that satisfy the equation \( b = 24a - 40c \) within the range \( 0 \leq a, b, c \leq 6 \).

7. By trial and error or systematic checking, we find that:
   \[
   a = 5, \quad b = 0, \quad c = 3
   \]
   satisfy the equation:
   \[
   b = 24(5) - 40(3) = 120 - 120 = 0
   \]

8. Substitute \( a = 5 \), \( b = 0 \), and \( c = 3 \) back into the base-7 representation to find \( n \):
   \[
   n = 49a + 7b + c = 49(5) + 7(0) + 3 = 245 + 0 + 3 = 248
   \]

The final answer is \( \boxed{248} \).