Question

Answer is 35 degree give me full explanation ​

Answer 1

Step-by-step explanation:

AOB is a straight line

So, < AOB = 180°

Hence,

3x + x + 40° = 180°

4x = 180 - 40

x = 140/4

x = 35°

Answer 2

$\huge\mathfrak\red{Answer}$

$3x + x + 40° = 180° \\ 4x + 40° = 180° \\ 4x = 180° - 40° \\ 4x = 140° \\ x = \frac{140°}{4} \\ x = 35°$

$3x = 3 \times 35 °= 105°$

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