Let x and y be distinct integers where 1 ≤ x ≤ 25 and 1 ≤ y ≤ 25. Then, the number of ways of choosing x and y, such that x+y is divisible by 5, is…

Let $\displaystyle x$ and $\displaystyle y$ be distinct integers where $\displaystyle 1 \leq x \leq 25$ and $\displaystyle 1 \leq y \leq 25$. Then, the number of ways of choosing $\displaystyle x$ and $\displaystyle y$, such that $\displaystyle x+y$ is divisible by $\displaystyle 5$ , is $\displaystyle \_\_\_\_$.