GAUSS7 2020 Problem 18

Two isosceles triangles each have at least one angle that measures 70^{\circ}. In the first triangle, the measure in degrees of each of the remaining two angles is even. In the second triangle, the measure in degrees of each of the remaining two angles is odd. In the first triangle, the sum of the equal angles is S. In the second triangle, the sum of the equal angles is T. The value of S+T is

Answer Choices
A. 280^{\circ}
B. 250^{\circ}
C. 220^{\circ}
D. 200^{\circ}
E. 300^{\circ}