Answer:
x = 25
Step-by-step explanation:
Sun of the exterior angles of a quadrilateral = 360°
Therefore:
x + 40 + 6x + 2x + 20 + 3x = 360
Add like terms
x + 6x + 2x + 3x + 40 + 20 = 360
12x + 60 = 360
12x = 360 - 60
12x = 300
x = 300/12
