Question 608472
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Hi
Note: Sum of an angle and it's supplement = 180° 
Let x and (180-x)represent the measure of the complement and it's supplement
Question states***
100 degrees less than two times the supplement of the angle is thrice of its complement
Write as we Read:
 2(180-x)-100 = 3x
 360 - 2x - 100=3x
 260= 5x
   52° = x is the complement, it's supplement is 128°
CHECKING our Answer***
256-100=156 = 3· 52