Firstly, we will draw diagram of this problem
we are given
∠DAB=125º
∠ACB=30º
Since, ∠DAB is exterior angle
∠ACB and ∠ABC are interior angles
and we know that
exterior angle is sum of two interior angles
so, we get
∠DAB=∠ACB +∠ABC
now, we can plug values
125º=30º+∠ABC
∠ABC=95º.............Answer
