Sum of all angles inside the triangle is 180 so, unknown angle would be:
x+30+85 = 180
x = 180 - 115
x = 65
Now, that unknown angle with y makes 180 angle, [linear pair equation]
so, y + 65 = 180
y = 180-65
y = 115
In short, Your Answer would be 115
Hope this helps!
