Give the two exterior angles of 133 and 142, we can deduce that the interior angles are 47 and 38, respectively. In fact, if [tex]i[/tex] and [tex]e[/tex] are the interior and exterior angles, respectively, we have
[tex]i=180-e[/tex]
Now, the interior angles of a triangle sum up to 180 degrees. Since we already have angles of 47 and 38 degrees, the missing angle is
[tex]180-47-38=95[/tex]
Which implies
[tex]n=180-95=85[/tex]
