Question 1109017
One third of a polygon's interior angles are 150°, another third are 140° and the others are 160°. Find the number of sides in the polygon. 
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One third of a polygon's exterior angles are 30°, another third are 40° and the others are 20°. Find the number of sides in the polygon.
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n = # of sides
(n/3)*30 + (n/3)*40 + (n/3)*20 = 360
10n + 20n = 360
n = 12 sides