For this problem, we are given a line that intersects two other parallel ones. We need to calculate the value of the angle PQN if the value of ONQ is 115º.
The angles PQN and ONQ are called "alternate interior angles" because they are on the interior of the parallel lines, and on opposite sides of the transversal one. These types of angles have the same measurement, therefore if ONQ is equal to 115º, then PQN is also equal to 115º.