Question

Here s my question: one angle is three times it's supplement increased by 20 deg. Find the measures of the two supplementary angles.

Answer 1

x = 3 (180 - x + 20)
= 3 (200 - x)
= 600 - 3x
So
4x = 600
x = 150
One angle is 150, the other is 30.

Answer 2

Degrees, of course.

Answer 3

x = 3 ( 180 -x ) + 20
x = 540 - 3x + 20
4x = 560
->x = 560/4 = 140 degree
its complement 40 degree