Hi,

The supplement of an angle 'x' is three times as large as the complement of the same angle.

Question states***

 180°-x = 3(90°-x)

   2x =270° - 180° = 90°

    x = 45°, its compliment is (90° - 45°) = 45°

CHECKING our answer***Supplement is 135°

  135° = 3(45°) 

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