Angle A = x + 20
Angle B = x
Therefore, x + x + 20 = 180 (as given in question)
= 2x + 20 = 180
= 2x = 180 -20 (Transposing 20 from LHS to RHS)
= 2x = 160
x = [tex]\frac{160}{2}[/tex] ( Transposing 2 from LHS to RHS)
= 80
Answer : Angle A = 80 degrees
Angle B = 80 + 20 = 100 degrees
