25° is the correct answer.
Step-by-step explanation:
(4x+20) +60°=180° [°.° Linear Pairs]
[tex](4x + 20) + 60° = 180°\\ ⟹ 4x + 20 + 60° = 180° \\ ⟹ 4x + 80° = 180° \\ ⟹ 4x = 180° - 80° \\ ⟹x = \frac{100°}{4} \\ ⟹25°[/tex]
.°. x = 25°
