Respuesta :

devishri1977

Answer:

Step-by-step explanation:

In a parallelogram, sum of adjacent angles is 180

3x + 120 = 180

3x = 180 - 120

3x  = 60   {Divide both sides by 3}

3x/3 = 60/3

x = 20

nermay7

Answer: The value of x is 20.

Step-by-step explanation:

3x + 120 = 180

     -120     120

3x = 60

x= 20

3(20) = 60