The angles 131°; 160° and n° are the exterior angles of the triangle.
The sum of measure of an exterior angles of the triangle is equal 360°.
Therefore we have the equation:
[tex]131^o+160^o+n^o=360^o\\\\291^o+n^o=360^o\ \ \ \ |-291^o\\\\n^o=69^o[/tex]
Answer: A. 69°
