Hi

Let x, 4x and (5x-11)represent angles A,B and C respectively

Question states***

  x + 4x + (5x-11°) = 180°

Solving for x

       10x = 191°

         x = 19.1°, measure of Angle A.  B is 76.4° and C is 84.5°

CHECKING our Answer***

  19.1° + 76.4° + 84.5° = 180° 

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