Verified answer

Answer:

30

Step-by-step explanation:

if we draw the figure we will see that angle A + C=180

equation= 3x-20+x+40=180

4x-60=180

4x=120

x=30

Answer:

6x - 40 + 2x +40 = 360 , 8x = 360    x = 45

Step-by-step explanation: