Hi,

The measure of one angle is 30° more than twice the other

Let x and (2x +30°) represent the measures of these angles

Question states*** "Angles are supplementary

  x + (2x +30°) = 180°

Solving for x

    3x = 150°

      x = 50°,  It's supplementary angle is 130°     (2*50°+30

CHECKING our Answer***

  50° + 130° = 180° 

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