In triangle $ABC$, the measure of $\angle A$ is $86$ degrees. The measure of $\angle B$ is $25$ degrees more than three times the measure of $\angle C$. What is the measure, in degrees, of $\angle C$?
A + B + C = 180
86 + (3C + 25) + C = 180 simplify
86 + 25 + 4C = 180
111 + 4C = 180
4C = 180 - 111
C = ( 180 - 111) / 4 = 17.25°
