Answer:
n = 69
Step-by-step explanation:
The three lines intersect and form a triangle. The angle n is the exterior angle of this triangle. Since an exterior angle of a triangle is equal to the sum of the two opposite interior angles, n can be found by finding the supplementary angles of 160 and 131.
The supplementary angles to 160 and 131 are the angle which adds to 180 with it.
180 - 160 = 20
180 - 131 = 49
These are the interior angles to the triangle.
n = 20 + 49 = 69
