Two angles are complementary when they add up to 90 degrees
smaller angle = x
larger angle = 2x
x + 2x = 90
3x = 90
x = 90/3
x = 30° ← smaller angle
larger angle = 2x = 2 * 30 = 60°
larger angle - smaller angle = 60° - 30° = 30°
The larger angle is 30 degrees greater than the smaller angle.