Question

find x in the following figure​

Answer 1

Answer:

angleABC=180-120 (linear pair)

=60°

now all three sides add up(ASP)

X+X+30 +60=180

2x +90=180

2x=90

X=45

Answer 2

Answer:

x+30 + x = 120( exterior angle of a triangle is equal to the sum of opposite interior angles)

2x= 120-30

x= 90/2

x= 45