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Let the 3rd interior angle be 180-80=100deg. so by angle sum property 5x +3x +100= 180 degree. therefore 8x=80 therefore x=10 and angle 5x=50 degree and angle 3x =30 degree

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Let the required number be x exterior angle=sum of interior opposite angles 80=5x+3x 80=8x 80/8=x x=10 the anglesare 5x=50,3x=30