#### Answer

The two angles are 50 and 130.

#### Work Step by Step

Let X represent the smaller angle.
Three times the smaller angle means 3X
20 less than three times the smaller angle means 3X - 20
Since the two angles are supplementary, their sum is 180. Thus, we obtain:
X + 3X - 20 = 180
4X - 20 = 180
Add 20 to both sides
4X = 200
Divide both sides by 4
X = 50
Since X = 50, 3X - 20 = 130
The two angles are 50 and 130.