Question

The measure of an angle is 60° less than nineteen times the measure of its supplement. what is the measure of the angle?

Answer 1

Two angles are supplementary when they add up to 180 degrees.

x = angle
19x-60 = supplement angle

x + 19x - 60 = 180
20x = 180 + 60
20x = 240
x = 240/20
x = 12°  ← answer