Question 406829
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Hi
Let x,(90°-x),(180°-x) represent the angle, its complement and sumpplement respectively
Question states***
{{{5/2 = (180-x)/(90-x)}}}
Solving for x by cross multiplying
 5(90-x)=2(180-x)
   450-5x = 360 - 2x
      90° = 3x
       x = 30°
CHECKING our Answer***
  5/2 = 150/60