Answer:
25 degrees
Explanation:
Because lines p and q are parallel and lines r and s are parallel as well, and these lines intersect each other, due to alternate interior and exterior angle theorem, we can assume angle 15 is congruent to angle 1.
We can find the value of angle 1 because we know that angle 1 + the neigboring 65 degree angle make up a right angle. By doing 90 degrees -- 65 degrees we get 25 degrees. This means angle 1 is 25 degrees.
Since angle 1 is congruent to angle 15, using the theorem, angle 15 is then 25 degrees.