Question

The vertex of an isosceles triangle measures 15 degrees more than one of its base angles how many degrees are there in a base angle of the triangle

Answer 1

V=B+15
V+2B=180
Therefore:
3B+15=180
B=55
V=70

Check:
V+2B=180
70+2(55)=180
70+110=180
180=180. Checks.