Answer:
A
Step-by-step explanation:
If you input 20 for x & add it up you will get 60 degrees for both angles.
This is correct because vertical angles are always congruent
x = 20
The angles are vertical angles which means they are equal
x+40 = 3x
Subtract x from each side
x+40-x = 3x-x
40 = 2x
Divide by 2
40/2 = 2x/2
20 =x
