A coin that comes up heads with probability $ p > 0$ and tails with probability $ 1\minus{}p > 0$ independently on each flip is flipped eight times. Suppose the probability of three heads and five tails is equal to $ \frac{1}{25}$ of the probability of five heads and three tails. Let $ p \equal{} \frac{m}{n}$, where $ m$ and $ n$ are relatively prime positive integers. Find $ m\plus{}n$.
1. We start by setting up the equation for the probability of getting three heads and five tails, and the probability of getting five heads and three tails. The probability of getting exactly \( k \) heads in \( n \) flips of a biased coin (with probability \( p \) of heads) is given by the binomial distribution formula:
   \[
   P(X = k) = \binom{n}{k} p^k (1 - p)^{n - k}
   \]
   For our problem, we have \( n = 8 \).

2. The probability of getting three heads and five tails is:
   \[
   P(3H, 5T) = \binom{8}{3} p^3 (1 - p)^5
   \]
   The probability of getting five heads and three tails is:
   \[
   P(5H, 3T) = \binom{8}{5} p^5 (1 - p)^3
   \]

3. According to the problem, the probability of three heads and five tails is \(\frac{1}{25}\) of the probability of five heads and three tails:
   \[
   \binom{8}{3} p^3 (1 - p)^5 = \frac{1}{25} \binom{8}{5} p^5 (1 - p)^3
   \]

4. Using the identity \(\binom{n}{k} = \binom{n}{n - k}\), we know that \(\binom{8}{3} = \binom{8}{5}\). Therefore, we can simplify the equation:
   \[
   \binom{8}{3} p^3 (1 - p)^5 = \frac{1}{25} \binom{8}{3} p^5 (1 - p)^3
   \]

5. Canceling \(\binom{8}{3}\) from both sides, we get:
   \[
   p^3 (1 - p)^5 = \frac{1}{25} p^5 (1 - p)^3
   \]

6. Dividing both sides by \( p^3 (1 - p)^3 \) (assuming \( p \neq 0 \) and \( p \neq 1 \)):
   \[
   (1 - p)^2 = \frac{1}{25} p^2
   \]

7. Taking the square root of both sides:
   \[
   1 - p = \frac{p}{5}
   \]

8. Solving for \( p \):
   \[
   5(1 - p) = p
   \]
   \[
   5 - 5p = p
   \]
   \[
   5 = 6p
   \]
   \[
   p = \frac{5}{6}
   \]

9. We are given that \( p = \frac{m}{n} \) where \( m \) and \( n \) are relatively prime positive integers. Here, \( m = 5 \) and \( n = 6 \), and they are relatively prime.

10. Therefore, \( m + n = 5 + 6 = 11 \).

The final answer is \( \boxed{11} \).