Answer:
x = 50
Step-by-step explanation:
The sum of the exterior angles of a polygon = 360°
The given angles are exterior angles of the polygon, thus
2x + 2x + x + 40 + x + 20 = 360, that is
6x + 60 = 360 ( subtract 60 from both sides )
6x = 300 ( divide both sides by 6 )
x = 50
