Answer:
The measure of the angle is 55°
Step-by-step explanation:
Take an angle A and let its complement be x°
Its supplement is 20° + 3x°
Supplementary angles add up to 180° so;
Angle A = 180° - (20° + 3x°) = 160° - 3x°
Complementary angles add up to 90° so;
x° + 160° - 3x° = 90°
-2x° = -70° , x° = 35°
So the complement of the angle A is 35°
Angle A is 90° - 35° = 55°
And its supplement is 180° - 55° = 125°
