Triangle problem from exam

[Dan Rutter]

I encountered this problem on the GRE today. Unless I read the question wrong, or I am a complete moran I did not see an answer that was the correct answer to the question.

There is a triangle shown, two of the angles are labled T degree. The third angle of the triangle is labled N degree. It is said that the mean degree of the triangles labled T degree is 65. So the mean of T1, and T2 is 65. You are to figure out what degree N is.

The answers given to choose from are 60, 65, 70, 75, 80.

So, what's the answer to the question?