Explanation:
Since the sum of the angles in a straight line is 180, and we know that angle four is 120, to find angle 3, simply subtract 120 from 180.
Angle 3 is 180-120 = 60
Since we know 2 angles already, we have: 60 + 95 = 155. Now subtract that from 180.
Angle 1 is 180-155 = 25