The value of 'x' is

50 60 30 40

60

Sum of all exterior angles of any polygon = 360° Thus, ⇒ (x+ 30)° + 100° + (2x)° + 50° = 360° ⇒ (3x)° + 180° = 360° ⇒ (3x)° = 360° - 180° = 180° ⇒ x = 60°